I will be adding a bedroom, possibly newer windows to the top unit, fix a pipe, and redoing the roof.  

Lack of adequate heating facilities.Violation 4: Hazardous PlumbingNarrative/ Ordinance Description: Please repair and replace exposed piping from the property water is currently turned off.

The tank had to be inspected and cleaned as oil dries in an empty tank and clog the pipes and furnace.We had the tank auto refilled, the oil company sends me the bill, and I in turn bill the tenant.

I can never know for sure if the pipes or wiring was replaced (my biggest concern), I don't think an inspector can actually tell as well since you have to tear down the entire house.

Issue: Last October 2023, a pipe under the floor leaked from my upper condo unit to the downstairs unit causing damage to the neighbor's kitchen.My condo was paid off, so little did I know, I didn't buy an insurance policy at that time (failed). 

Does this bathroom have an exhaust fan?

I’m considering using materials such as wood, PVC, conduit, or metal pipes, combined with canvas, tarp, or plastic for the covering.

It looks more like a commercial exhaust fan than a vent.  

I'm debating whether or not to fix old sewer waste pipe.

Re-piped the whole property, built a laundry room, expanded the pool deck and added pavers, refenced the property, re-built 2 exterior staircases, re-landscaped, and put in all new cabinets, granite, appliances, LVP flooring, lights, doors, blinds, etc.What was the outcome?