Well, I was wrong, just ind the true history:

http://www.bilderbuch-koeln.de/Fotos/alt...storisch_132085

After WW II they build the new Opera over a part of the Streitzeuggasse. The western part today is named "Am alten Posthof". On the picture is seen Streitzeuggasse 82, five buildings earlier than C. Adam.

Cheers,
Wolfgang