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Looks like a selfshadowing (bias) issue of the sun. Maybe it helps if you tell which scene units you are using and is the model in the near of the origin (0,0,0)? Is the model size right like in the real world, it means the building is 50m instead 50cm?
jaeyoungkk , generally, what you're seeing there (facet shadowing) is due to a current limitation - this behavior is also usually not that visible. We'll try to improve this for future versions though. Besides that, if you could still give us an answer to the questions from Micha , that would be great.