Cyrillic House Letters

I went on my bike from Alexanderplatz along Karl-Marx-Strasse (East-Berlin) and I saw a sad old house on the left, dead windows, void. With metal bars on the roof that obviously held letters before its death. I can’t remember what was up there, they look very cyrillic. Does anyone know? The first 2 look like an E and a P … (P = cyrillic R).