yea it's possible. the easiest way you can repeat a uv texture is if you select the faces of the building you want to texture, then apply your texture.

as for the texture, you should be able to get away with a 512X512 applied to the color (and bump if you prefer) channels... you'll notice that in the attribute editor, when you apply a file to your color node, that towards the top of your attribute window you'll see two tabs... a 'file1' tab and a 'place2dTexture1' tab. if you switch to the place2dtexture1 tab, you'll see that there's a 'Repeat UV' section. there, you can choose how many times your texture tiles. be careful, though, cause if your camera is far away enough, your tiling texture might be very obvious.

as for 'the resolution of my brick wall is not up to scratch'... i think you just need to build some better bricks if you're not happy with them.