During one of my rehabs they made me replace a brand new window I installed because it was 2 inches short from code.

I have currently installed dehumidifier and monitoring the status.

He demanded of me to install central AC or he will have to take this matter to court. 

Quote from @Saijal Sindwani: This is an example of how DIY landlords fail to protect their investment.

I'm seeking advice on the best way to implement this fairly and effectively.Here are a few options I've considered:Submetering: Installing individual water meters for each unit could be a solution, allowing each tenant to be billed based on their usage.

The walls can't be cracking and 1990's beige when you installed brand new hardwoods throughout.And, while new cabinets and counters and appliances are nice, if they are not well laid out, or you jam an island into a space that does not allow for stools to be pushed out, or the oven door to open because it hits a cabinet pull, that new kitchen is meaningless. 

A detached garage was built off site and delivered and is the only work I didn't do, although I did wire the building and install the garage door.

The property also has firepit in the backyard, smart door lock, cameras, thermostat, and router installed.

It's very user friendly and makes diy property management easy.

I hope that most people here are aware that landlords of commercial properties make huge profits out of installing solar power to their commercial properties.