Or a PM bizz  etc etc all of these are RE based but you dont need to own any RE per se . when you have investors that are not in the bizz IE not brokers lenders GC's etc etc they to me are true investors and depending on their background and funding ability scaling can be a pipe dream or one can methodically do it in what ever rental props they want to buy..

I once did a repipe and the customer wanted me to use their copper pipe, which sat under their house for a few years.

In response, I had a plumber and a water restoration company come to assess the situation.The restoration company cut into the drywall, and the plumber thoroughly inspected all the pipes, performed a leak test, and conducted a pressure test.

You can look at a mobile home and see it as an easy rental with new carpet, trim and some paint but there are other bigger uglier expenses that can come up.Roof Replacement, soft floors (water damage) in kitchens and bathrooms- most floors are particle board, exterior door replacement (special order), underbelly insulation falling, bad hot water tanks with rotten floor underneath (real joy), bad windows (water again), bad bloated siding (water), water damaged base frame around perimeter of home, cracked tubs (special orders) and frozen pipes (Good luck finding a plumber to come work on a mobile home- they do not exist). 

Some things come up that might be hidden which could be piping that needs to be changed out under a raised foundation or something like that for example. 

When you have a minor leak beneath a bathroom, it's most likely from the drain pipes, which is why the water only leaks when someone uses the bathroom.

We found out the potentially the whole block has led pipes so we are needing a contractor to cut a hole in the floor.   

I should clarify a couple of things - the city is abandoning their current drain line as its undersized and installing larger pipe next to it so can't be a trenchless pipe but would have been nice. 

These include accidents (I recently had 2 units destroyed by fire), natural disasters (I have had two units each hit by 2 hurricanes), property management turn over (they sell or stop being as good, I have experienced both), or turn over of team (I am turning over at handyman and I suspect plumber), or just wear n tear of property (slab leak in poor location, sewer pipes rotted out (one unit this month), roof, foundation issue, etc.).  

If the temperature goes below freezing point, pipes might burst.