Exhibit 99.3

The Blackstone Group L.P. and Harbourmaster Capital (Holdings) Limited

Unaudited Pro Forma Condensed Combined Financial Statements

On January 5, 2012, The Blackstone Group L.P. (“Blackstone”) completed its previously announced acquisition of all of the outstanding share capital of Harbourmaster Capital (Holdings) Limited (“Harbourmaster”), an Island of Jersey entity, in accordance with the sale and purchase agreement entered into on October 6, 2011, for consideration consisting of cash (the “Acquisition”). The unaudited pro forma condensed combined statements of operations and the unaudited pro forma condensed combined statement of financial condition are based upon the historical consolidated financial statements of Blackstone and Harbourmaster after giving effect to the Acquisition, and after applying the assumptions, reclassifications and adjustments described in the accompanying notes to the unaudited pro forma condensed combined financial statements.

The historical consolidated financial statements of Harbourmaster were prepared in conformity with accounting principles generally accepted in the United Kingdom (“U.K. GAAP”), which differs in certain respects from accounting principles generally accepted in the United States of America (“U.S. GAAP”). Necessary adjustments have been made to reconcile the historical consolidated financial statements of Harbourmaster to U.S. GAAP. These adjustments relate primarily to differences such as the consolidation of variable interest entities and accounting for investments.

The unaudited pro forma condensed combined statement of financial condition as of June 30, 2011 set forth below gives effect to the acquisition of Harbourmaster as if the transaction had occurred at June 30, 2011.

The unaudited pro forma condensed combined statements of operations and explanatory notes of Blackstone set forth below for the year ended December 31, 2010 and for the six months ended June 30, 2011 give effect to the acquisition of Harbourmaster, accounted for as a purchase business combination, as if the acquisition had occurred on January 1, 2010.

The unaudited pro forma condensed combined statements of operations are provided for informational purposes only and do not purport to reflect the results of Blackstone’s operations had the transaction actually been consummated on January 1, 2010. Blackstone has made, in its opinion, all adjustments that are necessary to present fairly the pro forma financial data. The pro forma combined provision for income taxes may not represent the amounts that would have resulted had Blackstone and Harbourmaster filed consolidated income tax returns during the periods presented.

The purchase accounting adjustments reflected in these unaudited pro forma condensed combined financial statements are based on estimates and assumptions and therefore are subject to revision. Harbourmaster’s financial statement balances as of the January 5, 2012 closing may be significantly different than the June 30, 2011 balances used solely for the purposes of developing this pro forma information. In addition, as Blackstone’s management receives additional information its analysis of the fair value measurements of certain acquired assets and assumed liabilities could be materially different.

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THE BLACKSTONE GROUP L.P.

Unaudited Pro Forma Condensed Combined Statement of Financial Condition

June 30, 2011

(Dollars in Thousands)

See notes to unaudited pro forma condensed combined financial statements.

2

THE BLACKSTONE GROUP L.P.

Unaudited Pro Forma Condensed Combined Statement of Operations

Six Months Ended June 30, 2011

(Dollars in Thousands, Except Unit and Per Unit Data)

See notes to unaudited pro forma condensed combined financial statements.

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THE BLACKSTONE GROUP L.P.

Unaudited Pro Forma Condensed Combined Statement of Operations

Year Ended December 31, 2010

(Dollars in Thousands, Except Unit and Per Unit Data)

See notes to unaudited pro forma condensed combined financial statements.

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THE BLACKSTONE GROUP L.P.

Notes to Unaudited Pro Forma Condensed Combined Financial Statement

(All Dollars Are in Thousands, Except Unit and Per Unit Data, Except Where Noted)

1.     Basis of Pro Forma Presentation

The unaudited pro forma condensed combined statement of financial condition as of June 30, 2011 illustrates the effect of the Acquisition as if it had been completed on June 30, 2011. The unaudited pro forma condensed combined statement of operations for the six months ended June 30, 2011 and the year ended December 31, 2010, illustrates the effect of the acquisition as if it had been completed on January 1, 2010.

The historical consolidated financial information has been adjusted in the unaudited pro forma condensed combined financial statements to give effect to pro forma events that are directly attributable to the Acquisition, factually supportable, and with respect to the statement of operations, expected to have a continuing impact on the combined results.

This unaudited pro forma condensed combined financial information should be read in conjunction with:

The financial information for Harbourmaster as of June 30, 2011 and for the six months ended June 30, 2011 was derived from the unaudited accounting records of Harbourmaster after making adjustments to convert this financial information to U.S. GAAP and accounting policies consistent with that of Blackstone.

The financial statements of Harbourmaster were originally prepared using euros as the reporting currency. These financial statements, the related U.S. GAAP adjustments and the pro forma adjustments presented herein have been translated from euros to U.S. dollars using historic exchanges rates in accordance with U.S. GAAP accounting guidance. The exchange rates applicable to Harbourmaster during the periods presented are as follows:

Certain reclassifications and adjustments have been made to Harbourmaster’s historical balances in the unaudited pro forma condensed combined financial statements to conform to Blackstone’s presentation and accounting policies.

The unaudited pro forma condensed combined financial information has been presented for informational purposes only. The unaudited pro forma condensed combined financial statements were prepared in accordance with regulations of the Securities and Exchange Commission and should not be considered indicative of the financial

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THE BLACKSTONE GROUP L.P.

Notes to Unaudited Pro Forma Condensed Combined Financial Statement

(All Dollars Are in Thousands, Except Unit and Per Unit Data, Except Where Noted)

position or results of operations that would have occurred if the acquisition had been consummated on the dates indicated, nor are they indicative of the future financial position or results of operations of the combined company. There were no material transactions between Blackstone and Harbourmaster during the periods presented in the unaudited pro forma condensed combined financial statements that would need to be eliminated. The unaudited pro forma adjustments are based on currently available information and certain assumptions that Blackstone believes is reasonable and supportable.

The transaction consummated by the Acquisition will be accounted for under U.S. GAAP guidance. The acquisition accounting is dependent upon certain valuations and other studies that are currently subject to finalization. Accordingly, the pro forma adjustments included herein are preliminary and have been made solely for the purpose of providing unaudited pro forma condensed combined financial information and may be revised as additional information becomes available and as additional analyses are performed. Differences between these preliminary estimates reflected in these unaudited condensed combined financial statements and the final acquisition accounting may occur and these differences could have a material impact on the accompanying unaudited pro forma condensed combined financial statements and the combined company’s future results of operations, financial position and cash flows.

The unaudited pro forma condensed combined financial information does not reflect any cost savings, operating synergies or revenue enhancements that the combined company may achieve as a result of the Acquisition or the costs to integrate the operations of Blackstone and Harbourmaster or the costs necessary to achieve these cost savings, operating synergies and revenue enhancements.

2.     U.S. GAAP Adjustments for Harbourmaster

Harbourmaster serves as the investment manager for certain collateralized loan obligation (“CLO”) vehicles. These VIEs are not required to be consolidated under U.K. GAAP. Under U.S. GAAP, an analysis of each VIE is performed to determine if Harbourmaster is the primary beneficiary as defined in U.S. GAAP guidance. The U.S. GAAP adjustments consolidate those CLO vehicles which are VIEs where Harbourmaster has been evaluated as the primary beneficiary.

Harbourmaster held certain investments on which it had previously taken an impairment charge for an other than temporary decline in the fair value. During the year ended December 31, 2010, under U.K. GAAP, Harbourmaster reversed this impairment charge. Reversals of such charges are not permitted under U.S. GAAP. Accordingly, this reversal was removed from the U.S. GAAP statement of operations.

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THE BLACKSTONE GROUP L.P.

Notes to Unaudited Pro Forma Condensed Combined Financial Statement

(All Dollars Are in Thousands, Except Unit and Per Unit Data, Except Where Noted)

3.     Purchase Price and Pro Forma Adjustments

In accordance with the sale and purchase agreement of the Acquisition, $32.5 million of the purchase consideration will be held in escrow for up to five years to secure warranty and indemnity obligations of the sellers. As such, the purchase price may be adjusted post-closing.

These pro forma adjustments resulted in a decrease to Cash and Cash Equivalents of $232,044, an increase in Intangible Assets of $142,221, an increase in Other Assets of $17,398, an increase to Accounts Payable, Accrued Expenses and Other Liabilities of $17,398 and a net decrease to Partners’ Capital of $89,823, on the Unaudited Pro Forma Condensed Combined Statement of Financial Condition.

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THE BLACKSTONE GROUP L.P.

Notes to Unaudited Pro Forma Condensed Combined Financial Statement

(All Dollars Are in Thousands, Except Unit and Per Unit Data, Except Where Noted)

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THE BLACKSTONE GROUP L.P.

Notes to Unaudited Pro Forma Condensed Combined Financial Statement

(All Dollars Are in Thousands, Except Unit and Per Unit Data, Except Where Noted)

Pro Forma Net Income (Loss) per Common Unit for the six months ended June 30, 2011 and the year ended December 31, 2010 have been calculated using the same weighted average number of common units outstanding used by Blackstone in its Net Income (Loss) per Common Unit calculations.

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