unfortunately no 

must be a model for texture

am i missing something here or..

Isn't a bump map basically the same thing as a texture map..

If you map your texture parts to the texture, lets say for simplicity, 4 sections each section assigned to different models or different parts of the model, cant the bump map be designed the same way, with each quarter having a different bump map ?. 

This sounds like the way to go, all though you would or mite need large textures and bump maps to get decent resolution..

Or you can manually adjust the tiling of your textures (i guess they're tiling since its a building) and create a sort of what they nowadays call 'atlas' and place all the diffuse materials for your building in one texture and all you normal maps into another. I've been doing this for years and it works.
- In some cases its really easy (when your skin doesnt tile at all).
- If you manage to tile your textures only in one way (for example vertically) you can put various strips on one map (i do my roads this way).



- If the polycount isnt that much of a concern, you can split some surfaces and play with the uv map and make it tile over a piece of the 'atlas'.

There are 2 ways to go about this: either you get creative and find out your own technique to cheat these challenges, or you spend lots of cash for software, scripts, plugins, etc. then find out that there is no magical software and the first way was the smarter one