Light build ugly shadows

Development Rendering
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1

I’m making this procedural building and when I don’t build lighting, it looks brilliant.

http://i.imgur.com/Y9vaJ4n.jpg

But when I do, these shadows appear

http://i.imgur.com/nFTyV8h.jpg

How can I get rid of them? btw I am not using dynamic lighting

3

Ok, thanks! One problem with this is that light bake gives me text that tells me to decrease lightmap resolution caused by that large building. So somehow I need to optimize it even more.

4

I think I got it working. I made uv maps better, more square and decreased lightmap quality to 16, it looks suprisingly good even with that low resolution.