Repairs:  3,010Utilities:  2,884 (tenant pays heat/electric/gas, owner pays water/sewer and trash)Taxes:  8,925From my analysis, using the 50% rule, at the $3,070 gross, would leave $1535 after expenses.  

I also will get a new outdoor AC unit in the spring as the hail destroyed the coil on my old one. 

I personally don't like any growing in my rentals because of the water, heat, humidity are all negatives to a healthy house.

So I was full  I had nice units they were fully sheetrocked some with heat and a few had bathrooms and were doubles those I rented to car collectors. 150 a month for 10 by 20...  

I honestly believe that he at-least THINKS he smells mold and that he isn't just trying to get out of the lease.What would you do? 

The 4-unit bldg has 4 newer heating systems (natural gas).  

Last winter in the northeast was terrible, and we bought them a $300 room heater to try to help with the heating costs.

So if higher quality homes, I guess using a realtor is the alternative)I will stick to the fundamental in investment, for instance, investing in stocks i prefer to evaluate the fundamental of companies instead of chasing the most popular or heated stocks for long term success.

Tenants pay heat and I'll get about $425/month rent so $1275$800$340 main.

My tenants will pay their own Electricity and Heating utilities, the house has separated gas and electricity meters.