I cant see my gas station building while in object mode.
Looks good in edit mode:

But only dots are visible in object mode:

I cant see my gas station building while in object mode.
Looks good in edit mode:

But only dots are visible in object mode:

Your object has a halo material assigned to it.
change it to surface.


(By the way you also have issues with overlapping surfaces causing z-fighting. Fix it by removing doubles. See this answer: https://blender.stackexchange.com/a/21218/1853)
AltH. – David Jul 11 '15 at 00:50