Put a bunch of boxes and crap in that newly converted storage closet. 

I tried to convert a historical house and saw all the requirement the national historic house asked and gave up.

Rufo, so you are violating the HOA rules so I don't think they would cover anything if it is the fault of your guests.This will eventually catch up with you and could result in some big fines so maybe think of selling this or converting to a LTR instead.

Some of them have converted to flips, but I do not do flips because it is a job (stop flipping, stop earning).  

Most towel bars are 24 inches, but as we both know, most studs are 16 inches on center.

I really like having multiple opportunities to make income from 1 property, including a worst scenario of converting all the units to LTR. 

Which is why you may want to consider starting in multifamily and convert them to airbnbs which is what I did for a while.Best of luck to you. 

Maybe I could convert my garage to a movie theater or something?

I'd make sure it would do well with long term in case you get sick of mid term and want to convert it to long term.    

My question is, does anyone know if it is possible that I can convert the building into a 4 units apartment with that Mixed Use zoning or do I have to request a change of zoning?