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I suggest you try to find the closest looking model here on cgt and contact that artist via "hire me" button so you can try to make a deal with him/her to make you that building model that you need. Regarding price, more details will be needed, details as: what is polycount limit? Is there interior? Are details modeled or done with textures (details as roof paneling)etc. Artist will tell you how much he/she charge for that kind of a job and you can try to negotiate that. Good luck.
In my opinion there isn't such thing as paying too much or upset someone by offering low. Here on cgt you can find 3 exactly the same models with 3 different prices, it all depends how much someone appreciate their work and the level of quality.
