I find that a bit hard to believe... we're only talkin about the exterior of 2,500 windows, and not highrise windows either. At the absolute most it shouldn't be more than $10,000 and that's if you bid things at $8 a window in/out. Does it make sense that just the exterior of all those windows would be $20K? That would be a base of $16 a window. So, my advice to you is think about it logically, and come up with your own price.