I can also detect leaks, etc.

Our basement is halfway finished and has always had some leaking.

There’s job security in real estate….there’s always going to be a leaking toilet somewhere!

You may have an active leak or running toilet. 

When we started pulling off the back wall in the bathroom to repair the leak, we found that the current floor is built up essentially 6” above the old (original?)

Never had them in those buildings, and in my nicer (B) buildings did, but they would be more of a maintenance headache unless brand new (repairs, water bill, leaking, etc.).In-unit washer/dryer was something I have never seen in a C building...ever.

Leaks in the bathrooms or kitchen, water spots on the ceilings or walls, mold anywhere, cracks in the pipes or foundation.

If my roof leaks and I have to replace it, at month 6, am I going to be able to with all that money I'm saving per month up to that point ($150 = 6 z $25/month)?

Otherwise they're just going to go out and buy a bunch of teslas, iphone 18's and coach purses ;)

Typically I BRRRR any property that I purchase, but if I were in your situation, I'd simply use whatever cashflow is available to take care of any immediate needs, or to pay myself back for paying out-of-pocket for them prior to renting the place (i.e. leaking plumbing, damaged stairs).