So far as I know, the lead paint rules don't really kick in so long as you don't start tearing out walls and disturbing the original paint buried under layers of newer stuff.

These developments are actually better alternatives since they typically are contained within themselves and don’t disturb the neighbors like a residential non-owner occupied property would.

However do not make the mistake of settling for that tenant.... you will pay for it most likely this year when you have to evict them because they damage the property ..... disturb the neighbors ..... don’t cut the grass.....don’t shovel the sidewalk ....... run up your water bill....I could go in and on.

On the other hand it's disturbing to know there could be that much dishonesty going on.

While I'm not a lawyer and certainly not intimately familiar with the law in MA, the information that I've seen posted in several places says that you do not have the right to cause a disturbance outside your home.

Also, I learned that an animal that misbehaves, disturbs or toilets can be removed from a public place even if it is an actual "service" animal.  

It would be easier to evict them for unauthorized pets or disturbing the neighbors than for lying about their social media account. 

Is the unit quiet enough in that closet that it doesn't disturb tenants?

Call the cops if anyone is "hanging out" on your property or causing a disturbance (noise).

I understand people have issues with disturbances caused by short term tenants however long term tenants can be a nuisance too; and they ain't leaving.