Basically what everyone else said.
Go for more detail on the walls (5-height bricks are horrible for exteriors). I would personally use 1x3 bricks in a brick configuration, painted a mixture of Standard 7 and Standard 8 (assuming you're using the standard colorset), perhaps with a couple of bricks missing to further cement the "abandoned building" look.
Having the floor/ceiling baseplates be visible on the outside is a no-no, especially when they're different colors from the walls.
The vine's a nice touch but IMO it's too "thick." I would substitute some of the 1x1 blocks with 1x1f round studs, to make it look more organic.
The broken windows are cool, but they don't mesh well with the non-broken window bricks. Consider replacing those with 1x4x5 bricks painted Bold 9.
Overall, good build in my opinion.
Maybe we should have a "build critique" thread here.
