This picture of an otherwise copyrighted work may be distributed under the conditions of § 54 (1) Z. 5 of the Austrian copyright law which allows to reproduce, distribute, and publish architectural works of an actual building or other works of visual arts which were created to permanently remain at a public place.
Note: Due to the principle of Lex loci protectionis, this applies only to reuse of this picture in Austria. Reuse in other countries is subject to local law.