You just need to alter the values for the far clip plane if you find your scene is disappearing. Select the relative camera where the scene is disappearing, activate the attribute editor, then boost it up to about 1000 - 3000, I find this ample. If it still is looking wierd, the near clip plane may also need adjusting, try setting this to a higher number too, such as 0.5.
Where I work we have to create a lot of scenes to scale. We use a scale of 1/10th, which is really good. If your building is, say, 200m high, simply divide by 10 to get the distance in maya units...apply this to everything to get a nicely scaled scene.
Hope this helps.