I would say your best bet is to find one in which you simply own the land and fixtures. 

Now if it were something like punching holes in the walls or kicking the water closet loose from the mounting bolts, etc...that's something different. 

Unless the tax savings is large and secure (cannot simply be challenged to lose them), I would want a new cost basis. 

Are you terminating a lease or simply not renewing it? 

Or I'm simply too inexperienced to know where to look. 

You don't need their signature, you simply swear under oath in front of a notary that you did in-fact deliver it to the named person. 

I talked about it constantly and kept my eyes open for every opportunity.I've slowed simply because I have enough to keep me busy and am spending money on renovations rather than new acquisitions.

I've got the BP analysis tools as part of the pro membership, but there's a gaping hole in being able to actually do realistic analysis and that leads to my question:How can you estimate the rehab costs for analyzing deals? 

I would start the eviction process as it is usually a downhill slide and they will simply end up owing your more money.

They are poison and things are unlikely to ever get better.If they're not to the point of eviction, simply give them a 30-day notice to vacate and see if they leave.