alstria leases around 3,500 sqm in Dusseldorf

• Successful letting of property in Dusseldorf-Benrath

Hamburg, August 15, 2011 – alstria office REIT-AG (symbol: AOX, ISIN: DE000A0LD2U1), the leading German office REIT focused solely on acquiring, owning and managing office real estate in Germany, is announcing that it has agreed a long-term lease on its property in Dusseldorf-Benrath.

The new tenant, a service provider in the health care sector, signed a 10-year lease contract for around 3,500 sqm of office and ancillary space in the 5,000 sqm building. The start of the lease is planned for the third quarter of 2011, immediately after the building will be vacated by the current tenant.

“We are seeing a very dynamic leasing market, and this new success, underlines alstria’s ability to take advantage of the current market condition”, said Olivier Elamine, CEO of alstria. “This is the second time this year where alstria was able to secure a new tenant prior to the expiry of the previous lease, adding up to our strong asset management track record”.

The lease transaction was brokered exclusively by ANTEON Immobilien GmbH & Co.KG.

About alstria:

alstria office REIT-AG is an internally managed Real Estate Investment Trust (REIT) focused solely on acquiring, owning and managing office real estate in Germany. alstria was founded in January 2006 and was converted into the first German REIT in October 2007. Its headquarters are in Hamburg. The company owns a diversified portfolio of properties across attractive German office real estate markets. Its current portfolio comprises 74 properties with an aggregate lettable space of approx. 814,000 sqm and is valued at approximately EUR 1.4 bn. alstria office REIT-AG’s strategy is based on active asset and portfolio management as well as on establishing and maintaining good relationships with key customers and decision makers. alstria focuses on long-term real estate value creation.

For further information, please contact:

Ralf Dibbern, IR/PR

Phone: +49 (0) 40 / 226 341-329

Email: rdibbern@alstria.de

http://www.alstria.de/

www.alstria.blogspot,com

www.twitter.com/alstria_REIT

Disclaimer: This release constitutes neither an offer to sell nor a solicitation of an offer to buy any shares. As far as this press release contains forward-looking statements with respect to the business, financial condition and results of operations of alstria office REIT-AG (alstria), these statements are based on current expectations or beliefs of alstria's management. These forward-looking statements are subject to a number of risks and uncertainties that could cause actual results or performance of the Company to differ materially from those reflected in such forward-looking statements. Apart from other factors not mentioned here, differences could occur as a result of changes in the overall economic situation and the competitive environment – especially in the core business segments and markets of alstria. Also, the development of the financial markets and changes in national as well as international provisions particularly in the field of tax legislation and financial reporting standards could have an effect. Terrorist attacks and their consequences could increase the likelihood and the extent of differences. alstria undertakes no obligation to publicly release any revisions or updates to these forward-looking statements to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.