for those interested in “advanced” facade-building two ideas:
(i did these things with scraps of carton packages, veneer and coffee stirrers - good enough for indoors.
and please excuse the rough execution, these i built over a decade ago)
- give depth to your flats, by using pictures inside.
these pics from a comic are one inch behind the frontwall:

this “room” is about one inch in depth too. it was my first lighted building. a rearlight car bulb and some alu foil did the trick:



- use forced perspective.
these station buildings are 1:29 in the front, and 1:45 in the back (with a real depth of 6.5 inch):

