There's a large, unused space that's bare bones on the ground floor (as in looks like a basement, concrete floors and walls)  that could be renovated into an extra 1 bedroom unit.  

A few years ago Hammond cracked down on "split" properties; where LLs took SFR's and converted them to duplexes/tris by making the basement or attic areas separate living spaces.

Office many of the tenants can downsize to off the beaten path office locations or warehouse type space.

Make sure that the phone numbers you store for your friends are numbers only, no spaces or dashes or anything else.

If you test and no mold you'd be out the $400.00.I'd get the spot on ceiling figured out. you can use a moisture meter to see if it's damp and if it has attic or crawl space above get in there and check it out. a roof leak can travel and is hard to spot so if you can't figure it out right away go right after or during a good hard rain.As for the toilet, replace wax ring, the toilet may be sweating, it may have a small leak causing more sweating so get the flapper looked at, to limit the moisture around the toilet.I had a tenant do a mold test on my unit unannounced to me.

Would love to hear more things about good condo investments in that area where tenants would have to fight for living space!

This is sketchy to me- maybe the house in question has 300 sq feet you'd obviously turn into finished space to make it comp? 

Here's where the story gets interesting:  The second delinquent tenant rented the shared unit from me and split the space with his attorney whom he ran a side business with.  

One extra tip- If you’re looking to make a deal on a small space, you might be able to save some money by grabbing a studio.

However I've done the math, I know there is an ability to add spot lights to the big common parking area (with garage space for each unit!)