Why not take texture samples from the locational photos already provided. Even if that was the only human interactive stage where the "designer" literally only marks sections of images for the textures.
Ceiling heights can likely be extrapolated simply from photographs with the right programming. Find a photo with 5 people in it and approximate the building height from the peoples photographs.
I personally can approximate the height and width of a house simply by counting bricks and shingles, because I work in construction I need to know if my scaffolding poles or ladders will reach and you're lucky if you get a tape measure to extend past 7ft without it buckling. (a sheet of shingles is 2ft wide, so every 3 shingle tabs is 2 ft. A brick and mortar roughly make 4", so 3 courses of brick make roughly 1ft. vinyl siding is normally double 4.5", double 5" or double 6" per sheet in height, one sheet is 12' long. Concrete board is generally 3ft by 8" high. Aluminum is always 8" high, generally 12' or 12.5' wide; If I can do this without a pencil and paper inside 30 seconds, it shouldn't be difficult to make an algorithm to work this out.)
Extrapolating the interior of a building would likely be much harder, however pictures of these often come with scale references (IE people), but as with outside everything has to meet building codes and everything is made out of standardized parts. However, one great clue is handrails. First floor railings have to be a minimum of 36" high, second floor railings have to be a minimum of 42" high (standard is 42" by code for commercial spaces, regardless of height). Maximum 4" gap between vertical members, (generally made 4" on centre as a precaution), and no horizontal members between 4" in height and 35" in height as to make a railing climbable by a small child.
Turning a rendering of an entire mall level in a game into simply picking colour swatches would be huge. Yes a pro studio is going to invest more time in polish, but for the guy making an iPhone app and is never going to see a huge return on the time he invests. Then accepting a bit of 'cookie cutter' genericness in level design won't be a huge compromise if it's in a great game.
The national building codes of countries would give you all the information you need to extrapolate the size of rooms and buildings.