The Lease needs to be clear in its definition of what you are trying to accomplish here which is that the Tenant pays for all of the operating and maintenance expenses of the property.In addition be sure to include an understanding of who pays for major capital replacements (not just maintenance) such as replacement of the heating and air-conditioning units, water and sewer lines, electrical mains, roofs, glass, etc.

As @John Kent said, this is purely dictated by the purchase contract.  

What is the age of the property and it's infrastructure (roof, water heaters etc?)

My advice is not to waste your money on testing clean with bleach water and buy a mildew mold suppressant from hardware store it's a chemical you put in a pump up sprayer keeps mold from coming back if on a painted surface get a fungicide paint additive and repaint area.

The property itself pays off itself after mortgage, taxes, insurance, sewer, and water - and leaves some to reinvest.

It sustained water damage from a broken pipe in the kitchen last winter.

I only consider fire and water flood an emergency(a snake once too), most items can wait until I call the owner and get an approval anytime there is a repair.

Upgrade to water saving fixtures? 

(I use tools to do this.)And, you can take the pulse of a market every 6 months to gauge where it might be going by following job growth, migration trends, major employer actions, affordability, etc.I don't buy purely on appreciation potential. 

In my state that is lawful; also, we can evict for back rent as well.I can see, as we grow as a business, setting up accounts for each individual tenant can become a burden, i.e, bank fees and tracking all the accounts, etc; notwithstanding, we have enjoyed the freedom of leaving the burden of collection of rent to the bank.I thing as we grow larger we would want to transition of a paypal or pure electronic system, but for now we are OK.