new roof and updated interior of one unit What was the outcome?

But there is a lot of missing info that makes it hard to even begin.As other's noted, it could be any number of things, some more common than others.It might not even be bathroom related, i.e. a roof leak that is showing itself in a bathroom (but presumably this would be present when raining and shortly thereafter).Toilet, could be wax ring or the O ring that connects tank to bowl.  

Thank you Ned, that is exactly right, we actually check a condo/townhouse about 2 weeks ago, the thing was a condo with a basement, I cannot tell if it was a condo or townhome, anyway, the ceiling in the first floor was bowing, the 2nd floor, one of the bedroom was sinking, could not tell how this damage was done but the walls came apart from the floor, you could see the roof of the unit bowing inwards towards the structure a bit, and their "general contractor" estimate that for 5k they could straighten the property and level everything, even 1 window and 1 door looked so uneven that you would think  there was something wrong with your eyes...5k for structural damage, good luck with that one, we ran as far as we could from that....but we have seen they do inflate their ARV, since we learned the hard way , we go through these deals with a magnifying glass, I knew I was not so picky, numbers do not lie.Another thing that caught my attention, which I do not know if I am overly suspicious now that I am older, but they want to get the closing for us at the same time/day they are getting the property from whoever they buying it, which it seems to me they try to save on the closing by having a "dual" closing when in reality is just 1 closing and we are the one paying for it...I do not know there are few things that do not click right with this folks.

@Connor Castillo I would reach out to a broker that is willing to charge you a flat fee and find you the best rate on the rate sheet.

It is already leased and cashflowing, all new major systems except the roof which is 4 years old.

They are the oldest properties, in lower class neighborhoods, sometimes without tile roofs or stucco siding. 

He earned quick money as a wholesaler, and I have a house to keep)Rehab cost: $20k (vinyl floor, interior paint, new dual pane windows, new toilets and bathroom vanities, lights, new landscape, new AC condenser, all done by handyman, spent some extra money for minor plumbing and electric jobs, hydro jet sewer lines, clean up attic (had mice), added some insulationTime spent: 3 weeks (two handymen for the first two weeks, one for the last week)Value after repair: probably around $440kJobs still need to be done later: some dryrots, roof work (it's tile roof, roof doctor quoted me $9k, handyman said probably $5k, home inspector said $15k you can get a new shingle roof.

Rates for SFR's can now go as low a 5% flat and 2-4's are still down to 6%.

They are refusing to provide a hourly rate and number of hours it took for the apartment cleaning because it is contracted at a flat fee.

In 2021, a roof was 6k, now Same company is 10K.