Just few general modeling pointers about the polygon amounts. The smaller detached houses with smaller lots can be around 700 triangles while the more complex villas with larger lots can go up to 2000 triangles. Apartment buildings and tenements range from 1500 triangles to slightly over 3000, all depending on the need of getting the possible details right. Similar amounts of triangles apply to other style buildings from commercial to industrial and offices. Ploppables are a bit different what comes to lot sizes since they can be larger, to a certain degree. However, the same basic principles apply there as well: smaller buildings can do with fewer triangles than larger buildings. And modeling economically also has the benefit of making the UV mapping in some cases faster since there are fewer polygons to map and arrange. However, larger polycounts usually give more freedom in UV mapping since the model can be cut into smaller pieces rather than having large faces that require massive amounts of texturing space. Texture resolution is around 1024x1024 for most buildings but you can use a smaller texture (such as 1024x512) for smaller buildings and larger (2048x2048) if you are making a really huge building (although I advice starting with the relatively straightforward buildings like residential and so forth - but this is just my opinion). Also, as a tip: don't color anything on the diffuse texture in plain white or "almost white" since really white surfaces can look way too bright white especially in direct sunlight. Some a bit gray-ish color is generally better since a light gray can look a nice white-ish in the engine.
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