Maguire Properties Signs Approximately 45,000 Square Foot Lease with InnovaSystems International, Inc.

Maguire Properties, Inc. (NYSE:MPG), a Southern California-focused real estate investment trust, announced today it has executed a new lease with InnovaSystems International, Inc. for approximately 45,000 square feet at 2385 Northside Drive, which is part of the Mission City Corporate Center in San Diego, California. InnovaSystems is expected to take occupancy in the first quarter of 2010.

Mr. Nelson C. Rising, President and Chief Executive Officer, commented, "We are very pleased with the execution of this lease. InnovaSystems’ selection solidifies Mission City Corporate Center as a premier office campus offering a range of amenities in an ideal location.”

The Company previously announced it had extended the maturity date of the construction loan for this new building to August 2010.

InnovaSystems was represented by Randall Wood and Joseph Bernstein of Jones Lang LaSalle Americas, Inc. Peter Johnston, Christopher Powers and Stefan Khudic represented Maguire Properties in the transaction.

About Maguire Properties, Inc.

Maguire Properties, Inc. is the largest owner and operator of Class A office properties in the Los Angeles central business district and is primarily focused on owning and operating high-quality office properties in the Southern California market. Maguire Properties, Inc. is a full-service real estate company with substantial in-house expertise and resources in property management, marketing, leasing, acquisitions, development and financing. For more information on Maguire Properties, visit the Company’s website at www.maguireproperties.com.

Business Risks

This press release contains forward-looking statements based on current expectations, forecasts and assumptions that involve risks and uncertainties that could cause actual outcomes and results to differ materially. These risks and uncertainties include: general risks affecting the real estate industry (including, without limitation, the inability to enter into or renew leases at favorable rates, dependence on tenants’ financial condition, and competition from other developers, owners and operators of real estate); risks associated with the availability and terms of financing and the use of debt to fund acquisitions and developments; risks associated with the potential failure to manage effectively the Company’s growth and expansion into new markets, to complete acquisitions or to integrate acquisitions successfully; risks and uncertainties affecting property development and construction; risks associated with downturns in the national and local economies, increases in interest rates, and volatility in the securities markets; risks associated with joint ventures; potential liability for uninsured losses and environmental contamination; risks associated with the Company’s potential failure to qualify as a REIT under the Internal Revenue Code of 1986, as amended, and possible adverse changes in tax and environmental laws; and risks associated with the Company’s dependence on key personnel whose continued service is not guaranteed.

For a further list and description of such risks and uncertainties, see our Annual Report on Form 10-K/A filed with the Securities and Exchange Commission on April 28, 2008. The Company does not update forward-looking statements and disclaims any intention or obligation to update or revise them, whether as a result of new information, future events or otherwise.