I don't think that unity is a great modeling tool. you can make models with another software and import them to unity. like 3ds max or maya or cinema 4d.... but the easiest is google skutchup but comes with a lack of options. If you have other questions sir just ask and i will answer them.
Posts : 602 Points : 2477 Rep : 382 Join date : 2013-12-11 Age : 19
Unity is not very good in modelling, I mean you can create simple shapes, but other than that I recommend you look at blender tutorials, or other 3d modelling softwares. If you'd like to find some free building models you can download and directly import to you're game, you can find some on www.tf3dm.com