In English:
-for a name of the street+number we use addr:streetname
&addr:housenumber
For example:
addr:streetname=Иван Вазов
addr:housenumber=35

-for a neighborhood/residential complex and the number of THE BLOCK, we use addr:place+addr:housenumber(which, in this case is the number of the block)
addr:place=ж.к./кв. Люлин
addr:housenumber=бл. 35

I've personally surveyed these two buildings and tagged them as "on the ground". 