Hi,
Please check the Camera rollout, it could be that you have Limit to Visibility enabled which would remove trees from behind the camera.

On the other hand, I see there are some reflections in the buildings behind which is odd. If it isn't the camera issue mentioned above, I'd be tempted to put a simple chrome ball in place of the front building to rule out some odd materials, visibility or exclude settings. There's not a feature natively in FP that would exclude just one building.
Regarding a "don't show objects" option, I'm afraid there isn't one. You have the choice of several proxy displays, and you can of course disable the object, but you'd need to enable it again before rendering. I'll pass on the suggestion to the development team.
Best,
Paul