Notes to Consolidated Financial Statements

(unaudited)

Note 1. Organization

References herein to “Blackstone Mortgage Trust,” “Company,” “we,” “us” or “our” refer to Blackstone Mortgage Trust, Inc. and its subsidiaries unless the context specifically requires otherwise.

We are a real estate finance company that primarily originates and purchases senior mortgage loans collateralized by properties in the United States and Europe. We are externally managed by BXMT Advisors L.L.C., which we refer to as our Manager, a subsidiary of The Blackstone Group L.P., or Blackstone, and are a real estate investment trust traded on the New York Stock Exchange, or NYSE, under the symbol “BXMT.” We are headquartered in New York City.

We conduct our operations as a real estate investment trust, or REIT, for U.S. federal income tax purposes. We generally will not be subject to U.S. federal income taxes on our taxable income to the extent that we annually distribute all of our net taxable income to stockholders and maintain our qualification as a REIT. We also operate our business in a manner that permits us to maintain our exemption from registration under the Investment Company Act of 1940, as amended, or the Investment Company Act. We are organized as a holding company and conduct our business primarily through our various subsidiaries. Our business is organized into two operating segments, the Loan Origination segment and the CT Legacy Portfolio segment.

On April 26, 2013, our board of directors approved the change of our name from Capital Trust, Inc. to Blackstone Mortgage Trust, Inc., which we effected on May 6, 2013 concurrently with a one-for-ten reverse stock split of our class A common stock. Except where the context indicates otherwise, all class A common stock numbers herein have been adjusted to give retroactive effect to the reverse stock split.

Note 2. Summary of Significant Accounting Policies

The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States, or GAAP, for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. The consolidated financial statements, including the notes, are unaudited and exclude some of the disclosures required in audited financial statements. Management believes it has made all necessary adjustments (consisting of only normal recurring items) so that the consolidated financial statements are presented fairly and that estimates made in preparing its consolidated financial statements are reasonable and prudent. The operating results presented for interim periods are not necessarily indicative of the results that may be expected for any other interim period or for the entire year. The accompanying unaudited consolidated interim financial statements should be read in conjunction with the audited consolidated financial statements and the related management’s discussion and analysis of financial condition and results of operations included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2012 filed with the Securities and Exchange Commission.

Principles of Consolidation and Basis of Presentation

The accompanying financial statements include, on a consolidated basis, our accounts, the accounts of our wholly-owned subsidiaries, and variable interest entities, or VIEs, in which we are the primary beneficiary. All significant intercompany balances and transactions have been eliminated in consolidation. Certain of the assets and credit of our consolidated subsidiaries are not available to satisfy the debt or other obligations of us, our affiliates, or other entities.

VIEs are defined as entities in which equity investors (i) do not have the characteristics of a controlling financial interest, and/or (ii) do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support from other parties. The entity that consolidates a VIE is known as its primary beneficiary, and is generally the entity with (i) the power to direct the activities that most significantly impact the VIE’s economic performance, and (ii) the right to receive benefits from the VIE or the obligation to absorb losses of the VIE that could be significant to the VIE.

We have separately presented, following our consolidated balance sheet, the assets of consolidated VIEs that can only be used to satisfy the obligations of those VIEs, and the liabilities of consolidated VIEs that are non-recourse to us. We have aggregated all of such assets and liabilities of consolidated VIEs in this presentation due to our determination that these entities are substantively similar and therefore a further disaggregated presentation would not be more meaningful.

Our CT Legacy Partners, LLC, or CT Legacy Partners, subsidiary accounts for its operations in accordance with industry-specific GAAP accounting guidance for investment companies, pursuant to which it reports its investments at fair value. We have retained this specialized accounting in consolidation and, accordingly, report the loans and securities investments of CT Legacy Partners at fair value on our consolidated balance sheet.

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Blackstone Mortgage Trust, Inc. and Subsidiaries

Notes to Consolidated Financial Statements (continued)

(unaudited)

As more fully described in Note 3, we sold our investment management business to Blackstone in December 2012. As a result, the income and expense items related to our investment management business have been reclassified to income from discontinued operations on our consolidated statements of operations.

Certain reclassifications have been made in the presentation of the prior period consolidated financial statements to conform to the June 30, 2013 presentation.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results may ultimately differ from those estimates.

Revenue Recognition

Interest income from our loans receivable is recognized over the life of the investment using the effective interest method and is recorded on the accrual basis. Fees, premiums, discounts and direct costs associated with these investments are deferred until the loan is advanced and are then recognized over the term of the loan as an adjustment to yield. Income accrual is generally suspended for loans at the earlier of the date at which payments become 90 days past due or when, in the opinion of our Manager, recovery of income and principal becomes doubtful. Income is then recorded on the basis of cash received until accrual is resumed when the loan becomes contractually current and performance is demonstrated to be resumed.

Cash and Cash Equivalents

Cash and cash equivalents represents cash on hand, cash held in banks and liquid investments with original maturities of three months or less. We place our cash and cash equivalents with high credit quality institutions to minimize credit risk exposure. We may have bank balances in excess of federally insured amounts. We have not experienced, and do not expect, any losses on our demand deposits, commercial paper or money market investments.

Restricted Cash

We classify the cash balances held by CT Legacy Partners as restricted because, while these cash balances are available for use by CT Legacy Partners for operations, debt service, or other purposes, they cannot be used by us until our allocable share is distributed from CT Legacy Partners, and cannot be commingled with any of our other, unrestricted cash balances.

Loans Receivable, Provision for Loan Losses, Loans Held-for-Sale and Related Allowance

We purchase and originate commercial real estate debt and related instruments generally to be held as long-term investments at amortized cost. We are required to periodically evaluate each of these loans for possible impairment. Impairment is indicated when it is deemed probable that we will not be able to collect all amounts due according to the contractual terms of the loan. If a loan is determined to be impaired, we write down the loan through a charge to the provision for loan losses. Impairment on these loans is measured by comparing the estimated fair value of the underlying collateral to the book value of the respective loan. These valuations require significant judgments, which include assumptions regarding capitalization rates, leasing, creditworthiness of major tenants, occupancy rates, availability of financing, exit plan, loan sponsorship, actions of other lenders and other factors deemed necessary by our Manager. Actual losses, if any, could ultimately differ from these estimates.

Our Manager performs a quarterly review of our portfolio of loans. In conjunction with this review, our Manager assesses the performance of each loan, and assigns a risk rating based on several factors including risk of loss, loan-to-value ratio, or LTV, collateral performance, structure, exit plan, and sponsorship.

Loans are rated one through eight, which ratings are defined as follows:

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Blackstone Mortgage Trust, Inc. and Subsidiaries

Notes to Consolidated Financial Statements (continued)

(unaudited)

In certain cases, we may classify loans as held-for-sale based upon the specific facts and circumstances of particular loans, including known or expected transactions. Loans held-for-sale are carried at the lower of their amortized cost basis and fair value less cost to sell. A reduction in the fair value of loans held-for-sale is recorded as a charge to our consolidated statement of operations as a valuation allowance on loans held-for-sale.

Equity Investments in Unconsolidated Subsidiaries

Our carried interest in CT Opportunity Partners I, LP, or CTOPI is accounted for using the equity method. CTOPI’s assets and liabilities are not consolidated into our financial statements due to our determination that (i) it is not a VIE and (ii) the investors have sufficient rights to preclude consolidation by us. As such, we report our allocable percentage of the net assets of CTOPI on our consolidated balance sheet. We have deferred the recognition of income from CTOPI until cash is collected or appropriate contingencies have been eliminated and, therefore do not recognize any income from equity investments in unconsolidated subsidiaries.

Deferred Financing Costs

The deferred financing costs that are included in prepaid expenses and other assets on our consolidated balance sheets include issuance costs related to our debt obligations, and are amortized using the effective interest method, or a method that approximates the effective interest method, over the life of the related obligations.

Repurchase Obligations

We record investments financed with repurchase obligations as separate assets and the related borrowings under any repurchase agreements recorded as separate liabilities on our consolidated balance sheets. Interest income earned on the investments and interest expense incurred on the repurchase obligations are reported separately on our consolidated statements of operations.

Interest Rate Derivative Financial Instruments

In the normal course of business, we use interest rate derivative financial instruments to manage, or hedge, cash flow variability caused by interest rate fluctuations. Specifically, we may use interest rate swaps to convert floating rate liabilities that are financing fixed rate assets into fixed rate liabilities. The differential to be paid or received on these agreements is recognized on the accrual basis as an adjustment to the interest expense related to the attendant liability. In cases where interest rate swap agreements are terminated early, any gain or loss is generally amortized over the remaining life of the hedged item. These swap agreements must be effective in reducing the variability of cash flows of the hedged items in order to qualify for the aforementioned hedge accounting treatment. Changes in the fair value of effective cash flow hedges are reflected on our consolidated financial statements through accumulated other comprehensive income (loss) and do not affect our net income (loss). To the extent a derivative does not qualify for hedge accounting, and is deemed a non-hedge derivative, the changes in its fair value are included in net income (loss).

Fair Value of Financial Instruments

The “Fair Value Measurements and Disclosures” Topic of the Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or the Codification, defines fair value, establishes a framework for measuring fair value, and requires certain disclosures about fair value measurements under GAAP. Specifically, this guidance defines fair value based on exit price, or the price that would be received upon the sale of an asset or the transfer of a liability in an orderly transaction between market participants at the measurement date.

The “Fair Value Measurement and Disclosures” Topic of the Codification also establishes a fair value hierarchy that prioritizes and ranks the level of market price observability used in measuring financial instruments. Market price observability is affected by a number of factors, including the type of financial instrument, the characteristics specific to the financial instrument, and the state of the marketplace, including the existence and transparency of

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Blackstone Mortgage Trust, Inc. and Subsidiaries

Notes to Consolidated Financial Statements (continued)

(unaudited)

transactions between market participants. Financial instruments with readily available quoted prices in active markets generally will have a higher degree of market price observability and a lesser degree of judgment used in measuring fair value.

Financial instruments measured and reported at fair value are classified and disclosed based on the observability of inputs used in the determination, as follows:

Each type of asset recorded at fair value using Level 3 inputs are determined by an internal committee comprised of members of senior management of our Manager, including our chief executive officer, chief financial officer, and other senior officers.

Certain of our assets and liabilities are measured at fair value either (i) on a recurring basis, as of each quarter-end, or (ii) on a nonrecurring basis, as a result of impairment or other events. Our assets and liabilities that are measured at fair value are discussed further in Note 17. Generally, loans held-for-sale, loans receivable, and securities are measured at fair value on a recurring basis, while impaired loans are measured at fair value on a nonrecurring basis.

The following valuation techniques were used to estimate the fair value of each type of asset and liability which was recorded at fair value as of June 30, 2013 and December 31, 2012:

Loans held-for-sale: Loans held-for-sale are valued based on expected net proceeds from a sale of the asset.

Loans receivable, at fair value: Loans receivable are generally valued by discounting expected cash flows using internal cash flow models and estimated market rates. Expected cash flows of each loan are based on our Manager’s assumptions regarding the collection of principal and interest from the respective borrowers.

Other assets, at fair value: CT Legacy Partners’ other assets are generally valued by a combination of (i) obtaining assessments from third-party dealers and (ii) in cases where such assessments are unavailable or deemed not to be indicative of fair value, discounting expected cash flows using internal cash flow models and estimated market discount rates. In the case of internal models, expected cash flows of each security are based on assumptions regarding the collection of principal and interest on the underlying loans and securities.

Impaired loans : The loans identified for impairment are collateral dependent loans. Impairment on these loans is measured by comparing our Manager’s estimation of fair value of the underlying collateral less costs to sell, to the book value of the respective loan. These valuations require significant judgments, which include assumptions regarding capitalization rates, leasing, creditworthiness of major tenants, occupancy rates, availability of financing, exit plan, loan sponsorship, actions of other lenders and other factors deemed necessary by our Manager.

Investment in CT Legacy Asset: We arrived at the fair value of our Investment in CT Legacy Asset by discounting the net cash flows expected to be distributed to its equity holders after the repayment of the repurchase facility. To determine the net cash flows of CT Legacy Asset, our Manager estimated the timing and recovery amount for each of its assets, and then applied the proceeds to first satisfy the related repurchase facility.

We are also required by GAAP to disclose fair value information about financial instruments, whether or not recognized in the statement of financial position, for which it is practicable to estimate that value. In cases where quoted market prices are not available, fair values are estimated using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the estimated market discount rate and the estimated future cash flows. In that regard, the derived fair value estimates cannot be substantiated by comparison to independent markets and, in many cases, could not be realized in an immediate settlement of the instrument. Rather, these fair values reflect the amounts that our Manager believes are realizable in an orderly transaction among willing parties. These disclosure requirements exclude certain financial instruments and all non-financial instruments.

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Blackstone Mortgage Trust, Inc. and Subsidiaries

Notes to Consolidated Financial Statements (continued)

(unaudited)

The following methods and assumptions were used to estimate the fair value of each class of financial instruments, excluding those described above that are carried at fair value, for which it is practicable to estimate that value:

Cash and cash equivalents: The carrying amount of cash on deposit and in money market funds approximates fair value.

Restricted cash: The carrying amount of restricted cash approximates fair value.

Loans receivable, net: Other than impaired loans, these assets are recorded at their amortized cost and not at fair value. The fair values for these instruments are estimated by our Manager taking into consideration factors including capitalization rates, leasing, occupancy rates, availability and cost of financing, exit plan, sponsorship, actions of other lenders and indications of market value from other market participants.

S ecured notes: These notes are recorded at their aggregate principal balance and not at fair value. The fair value was estimated based on the rate at which a similar instrument would be priced today.

Repurchase obligations: These facilities were recorded at their aggregate principal balance and not at fair value. The fair value was estimated based on the rate at which a similar credit facility would be priced today.

Securitized debt obligations: These obligations are recorded at the face value of outstanding obligations to third-parties and not at fair value. The fair values for these instruments have been estimated by obtaining assessments from third-party dealers.

Income Taxes

Our financial results generally do not reflect provisions for current or deferred income taxes on our REIT taxable income. We believe that we operate in a manner that will continue to allow us to be taxed as a REIT and, as a result, we generally do not expect to pay substantial corporate level taxes other than those payable by our taxable REIT subsidiaries. Many of these requirements, however, are highly technical and complex. If we were to fail to meet these requirements, we may be subject to federal, state and local income tax on current and past income, and penalties. See Note 15 for additional information.

Accounting for Stock-Based Compensation

Stock-based compensation expense is recognized in net income using a fair value measurement method, which we determine with the assistance of a third-party appraisal firm. Compensation expense for the time vesting of stock-based compensation grants is recognized on the accelerated attribution method and compensation expense for performance vesting of stock-based compensation grants is recognized on a straight line basis.

The fair value of the performance vesting restricted class A common stock is measured on the grant date using a Monte Carlo simulation to estimate the probability of the market vesting conditions being satisfied. The Monte Carlo simulation is run approximately 100,000 times. For each simulation, the payoff is calculated at the settlement date, and is then discounted to the grant date at a risk-free interest rate. The average of the values over all simulations is the expected value of the restricted class A common stock on the grant date. The valuation is performed in a risk-neutral framework, so no assumption is made with respect to an equity risk premium. Significant assumptions used in the valuation include an expected term and stock price volatility, an estimated risk-free interest rate and an estimated dividend growth rate.

Comprehensive Income

The primary component of comprehensive income other than net income is the unrealized gains and losses on derivative financial instruments.

Earnings per Share of Common Stock

Basic earnings per share, or EPS, is computed based on the net earnings allocable to common stock and stock units, divided by the weighted average number of shares of common stock and stock units outstanding during the period. Diluted EPS is determined using the treasury stock method, and is based on the net earnings allocable to common stock and stock units, divided by the weighted average number of shares of common stock, stock units and potentially dilutive common stock options and warrants. On April 26, 2013, our board of directors approved a one-for-ten reverse stock split of our class A common stock which we effected on May 6, 2013. Our earnings per share disclosures have been retroactively adjusted to reflect the reverse stock split.

We have separately determined EPS and diluted EPS for income (loss) from continuing operations and for net income (loss) allocable to common stockholders. See Note 12 for additional discussion of earnings per share.

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Blackstone Mortgage Trust, Inc. and Subsidiaries

Notes to Consolidated Financial Statements (continued)

(unaudited)

Recent Accounting Pronouncements

In January 2013, the FASB issued Accounting Standards Update 2013-01, “Balance Sheet (Topic 210): Clarifying the Scope of Disclosures About Offsetting Assets and Liabilities,” or ASU 2013-01. ASU 2013-01 was developed to clarify which instruments and transactions are subject to the offsetting disclosure requirements set forth by Accounting Standards Update 2011-11 “Balance Sheet (Topic 210): Disclosures about Offsetting Assets and Liabilities.” ASU 2013-01 is effective for the first interim or annual period beginning on or after January 1, 2013, and should be applied retrospectively for all comparative periods presented. The adoption of ASU 2013-01 did not have a material impact on our consolidated financial statements.

In February 2013, the FASB issued Accounting Standards Update 2013-02, “Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income,” or ASU 2013-02. ASU 2013-02 implements the previously deferred requirement to disclose reclassification adjustments into and out of accumulated other comprehensive income in either a note or on the face of the financial statements. ASU 2013-02 is effective for the first interim or annual period beginning after December 15, 2012, and should be applied prospectively. As we no longer have a balance of accumulated other comprehensive income, the adoption of ASU 2013-02 did not have a material impact on our consolidated financial statements.

In June 2013, the FASB issued Accounting Standards Update 2013-08, “Financial Services-Investment Companies (Topic 946): Amendments to the Scope, Measurement, and Disclosure Requirements,” or ASU 2013-08. ASU 2013-08 amends the criteria for qualification as an investment company under Topic 946 of the FASB Accounting Standards Codification, or Topic 946, and requires additional disclosure by investment companies. ASU 2013-08 is effective for the first interim or annual period beginning after December 15, 2013, and should be applied prospectively. We currently consolidate CT Legacy Partners, which accounts for its operations as an investment company under Topic 946. We do not expect the adoption of ASU 2013-08 to impact CT Legacy Partners’ status as an investment company. Further, because ASU 2013-08 specifically excludes REITs from its scope, it will not otherwise impact our consolidated financial statements.

Note 3. Corporate Transactions

Blackstone Loan Warehouse Joint Venture

On May 13, 2013, we entered into a joint venture, 42-16 Partners, LLC, or 42-16 Partners, with an affiliate of our Manager to originate and warehouse loans prior to the completion of our class A common stock offering on May 29, 2013. 42-16 Partners was controlled by us and owned 16.7% by us and 83.3% by an affiliate of our Manager, and originated one senior mortgage loan on May 21, 2013. On May 30, 2013, we ended this relationship with the affiliate of our Manager and purchased 100% of the equity interests in 42-16 Partners held by the affiliate of our Manager using proceeds from the sale of our class A common stock and, as a result, 42-16 Partners became a 100% owned and consolidated subsidiary.

CT Legacy Partners Merger

To maintain its tax efficiency, on March 20, 2013, CT Legacy REIT Mezz Borrower, Inc., or CT Legacy REIT, was merged with and into CT Legacy Partners, LLC, or CT Legacy Partners, and whereby CT Legacy Partners was the surviving entity, effective as of March 22, 2013. We refer to this transaction as the Merger. As a result of the Merger, all outstanding shares of class A-1 common stock, class A-2 common stock, class B common stock, and class A preferred stock of CT Legacy REIT were converted into limited liability company shares, or LLC Shares, in CT Legacy Partners. These LLC Shares have economic and voting rights equivalent to the corresponding shares of stock of CT Legacy REIT. In addition, all outstanding shares of class B preferred stock of CT Legacy REIT were redeemed on March 21, 2013 for an aggregate $147,000, which amount is comprised of the shares’ par value, liquidation preference, and accrued dividends thereon.

As a result of the Merger, we have consolidated CT Legacy Partners as of March 20, 2013 and, therefore, the remaining legacy assets and liabilities from our comprehensive debt restructuring on March 31, 2011, which we refer to as our March 2011 Restructuring. See Note 8 and Note 12 for further discussion of CT Legacy Partners.

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Blackstone Mortgage Trust, Inc. and Subsidiaries

Notes to Consolidated Financial Statements (continued)

(unaudited)

Sale of Investment Management Platform

On December 19, 2012, pursuant to a purchase and sale agreement, dated as of September 27, 2012, or Purchase Agreement, by and between us and Blackstone, we completed the disposition of our investment management and special servicing business for a purchase price of $21.4 million. The sale included our equity interests in CT Investment Management Co., LLC, or CTIMCO, our related private investment fund co-investments, and 100% of the outstanding class A preferred stock of CT Legacy REIT. We refer the entire transaction as our Investment Management Business Sale. Pursuant to the terms of the Purchase Agreement, on December 19, 2012, we entered into a management agreement with our Manager, which was amended and restated as of March 26, 2013, pursuant to which we are now managed by our Manager pursuant to the terms and conditions of the management agreement. In addition, Blackstone received the right to designate two members of our board of directors, and exercised that right by designating an employee and one of its senior advisors to replace two former members of our board of directors who resigned effective December 19, 2012. As a result of the Investment Management Business Sale, the income and expense items related to our investment management business have been reclassified to income from discontinued operations on our consolidated statements of operations. See Note 14 for a further discussion of discontinued operations.

On December 19, 2012, we also closed our sale to Blackstone of 500,000 shares of our class A common stock for a purchase price of $10.0 million.

In connection with the consummation of the Investment Management Business Sale and the closing of our sale of 500,000 shares of class A common stock to Blackstone, we paid a $20.00 per share special cash dividend on December 20, 2012 to holders of record of our class A common stock at the close of business on November 12, 2012.

The assets we retained following our Investment Management Business Sale consisted primarily of: (i) cash and cash equivalents, (ii) our interests in CT Legacy Partners, a vehicle we formed to own and finance certain legacy assets that we retained in connection with a comprehensive debt restructuring in 2011, (iii) our carried interest in CTOPI, a private investment fund that was previously under our management and is now managed by an affiliate of our Manager, and (iv) our subordinated interests in certain collateral debt obligations, or CT CDOs.

CT CDO Deconsolidation

On December 19, 2012, as a result of the Investment Management Business Sale, we are no longer the collateral manager for certain collateralized debt obligations, or CT CDOs, nor the special servicer on their collateral assets. Due to the externalization of these management functions, and our lack of material economic interest in the residual equity we own in CT CDOs II and IV, we ceased to be the primary beneficiary of these entities and, therefore, discontinued the consolidation of CT CDOs II and IV, which we refer to as the CT CDO Deconsolidation. We recognized a gain of $53.9 million on the deconsolidation of CT CDOs II and IV, which was due primarily to the reversal of charges to shareholders’ equity resulting from losses previously recorded in excess of our economic interests in these non-recourse securitization vehicles.

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Blackstone Mortgage Trust, Inc. and Subsidiaries

Notes to Consolidated Financial Statements (continued)

(unaudited)

Note 5. Loans Receivable

As of June 30, 2013, our consolidated balance sheet includes $753.1 million of loans receivable related to our Loan Originations segment and $77.0 million of loans receivable owned by CT CDO I, a consolidated securitization vehicle included in our CT Legacy Portfolio segment. See Note 19 for further discussion of our operating segments.

Activity relating to our loans receivable for the six months ended June 30, 2013 was as follows ($ in thousands):

As of June 30, 2013, we had unfunded commitments of $8.6 million related to one senior mortgage loan, which amounts will only be funded to finance lease-related or capital expenditures by the borrower until the commitment terminates in June 2016.