Here's something that just occurred to me....
Let's say you're going to buy an apartment building. It doesn't really matter what size, but just for this example, let's say it's a twenty unit building. The building is fully occupied, and the tenets are all paying their rent. While you're doing your due diligence, however, you discover significant deferred maintenance issues, which necessitate some rehabbing on the building and the units. How do you go about getting the rehab done when the units are all occupied? I don't believe you're allowed to simply boot everyone out the door so you can spruce the place up, but you can't do the rehab with them in there. Assuming you can't finance the rehab out of your own pocket and do it gradually as each unit's lease expires, how can you do it?