Alstria office REIT : , COIMA RES, Colonial, Gecina, Great Portland Estates and NSI create a sustainability and innovation thinktank

Press release

alstria, COIMA RES, Colonial, Gecina, Great Portland Estates and NSI create a sustainability and innovation thinktank

Five leading European real estate companies pool their best practices and experience and create a sustainability and innovation thinktank

December 19, 2017 Olivier Elamine (CEO of alstria), Manfredi Catella (Founder & CEO of COIMA RES), Pere Viñolas Serra (CEO of Colonial), Méka Brunel (CEO of Gecina), Toby Courtauld (CEO of Great Portland Estates) and Bernd Stahli (CEO of NSI) agreed to create a thinktank that will group together the sustainability and innovation best practices and research of the six European REITs.

This forum for exchanges and initiatives will be complementary with the actions taken by each of the companies. It will be a framework for research projects, and any other initiative aimed at strengthening their capacity for innovation and implementing sustainability best practices.

alstria, COIMA RES, Colonial, Gecina, Great Portland Estates and NSI are leaders in their respective real estate markets. Their complementary positioning will make it possible to benefit from a pan-European scale with deep expertise across the German, Italian, Spanish, French, British and Dutch markets.

Olivier Elamine, Manfredi Catella, Pere Viñolas Serra, Méka Brunel, Toby Courtauld and Bernd Stahli declare in a joint statement:

"The real estate industry faces some major changes in terms of the expectations of its customers and prospects and it is also witnessing a genuine technological revolution. The idea to bring together the research and best practices of major European operators such as alstria, COIMA RES, Colonial, Gecina, Great Portland Estates and NSI illustrates the conviction that concrete initiatives will be triggered by carrying out joint research and exchanging experiences from our respective markets and projects".

Contact:

Ralf Dibbern, IR/PR Bäckerbreitergang 75 20355 Hamburg

Phone: [phone] Email:[e-mail]

More information on:www.alstria.comwww.twitter.com/alstria_REITwww.alstria.blogspot.comwww.beehive.work

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.