I bought a condo there in 2008 at peak market and lived in it until I converted it to a rental in 2014.  

You wont convert all of them but if you convert 1/10, it's a good lead source.

Another option for the ceiling is drywall over it or skim coat it.... if it's those square cardboard looking tiles then just sheet rock over it with 1/4 inch drywall.

One of my single family in Euclid had a problem with raw sewage during heavy rains mixing with the rain water and filling the basement with over 12 inches of that disgusting stuff. 

After an exhaustive search, I've got a set of high converting postcards and we're going to do 6 touches for each name on the list.  

So for example if you decided to convert the car wash site to McDonalds would you get a water credit since the water use would decrease significantly?

water and food shortages, public transport etc etc etc....have some compassion and make some temporary concessions on being a strong businessman and landlord.I would basically give them a one time "get out of jail free" card for late payment.... make it perfectly 1000% clear that this is a one time deal due to extreme circumstances...don't try and push it or there will be an eviction started.If they have been a good tenant and have had the respect to give you the "heads up" that they were going to have an issue paying on time, that counts for something with me....I know this is business and when you give an inch, tenants will often continue to push the envelope and take a mile...if they see you are "soft" they will exploit it.....but this is an extraordinary situation that just doesn't fit the rules.......

They basically occupy two bedrooms with a bath in between, one of the rooms converted into a modest kitchenette. 

For instance it is zoned to allow a duplex but I couldn't see anyway to convert it over given the structural constraints.Thanks!

I prefer to not touch them, as I think there is extra liability from renting out non conforming units and they have limited exit strategies, but if I did buy one I not only wouldn't pay extra for the non-conforming additions, but I'd also want a bigger discount such that converting to original and flipping as a single family was a profitable exit, thus restoring this as one of my exit strategy.