Alstria office REIT : Invitation H1 2021 Call – Update

INVITATION H1 2021 CALL Moved to 2:00 p.m. CEST on August 10

Ladies and Gentlemen, Due to a time conflict with another listed German real estate company, alstria office REIT-AG (Symbol: AOX, ISIN: DE000A0LD2U1) has decided to move the scheduled earnings call to 2:00 p.m. CEST on Tuesday, August 10, 2021. CEO Olivier Elamine and CFO Alexander Dexne will present the results for the first half of 2021 followed by a Q&A session. Dial-in numbers: GER: [phone] UK: [phone] PIN: 240 63 288# Please note that the presentation and the Q&A session can also be followed live via webcast on our website www.alstria.com. Shortly before the start of the conference call, the presentation slides will be available for download. The press release will be sent out the day before after market close at around 6:00 p.m. (CEST). The H1 interim report will then also be available on alstria's website.

Investor Relations Julius Stinauer Steinstrasse 7 20095 Hamburg, Germany [phone] [email protected] Press Contact Philip Angrabeit Steinstrasse 7 20095 Hamburg, Germany [phone] [email protected] Further information www.alstria.com www.beehive.work www.green-dividend.com www.twitter.com/alstria_REIT www.linkedin.com/company/alstria-office-reit-ag

About alstria alstria office REIT AG is the leading real-estate operator focusing solely on German office property in selected German markets. Our strategy is based on the ownership and an active management of our properties throughout their entire life cycle, strong added-value services to our customers and deep knowledge of the markets in which we operate. alstria strives for sustainable long-term value creation while taking advantage of short-term arbitrage of inefficiencies in the real estate markets. As of March 31, 2021, the portfolio comprises 110 buildings with a lettable area of 1.4 million square meters and a total portfolio value of EUR 4.6 billion.

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.

The current COVID-19 outbreak is creating substantial uncertainty in the marketplace. Although alstria has diligently reviewed the information contained in this release it is based on its own analysis and estimate, as well as available public sources and not on active discussion with tenants. As such the current liquidity risk of the tenants can materially differ from alstria's own estimate, and the actual impact of the COVID 19 outbreak may differ substantially from the current previsions.

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.