Found it. A 1/4" hole popped through the metal flashing (gutter drain) between the 2 slopes of roof. Basically I diverted a highway of water to the family room wall corner. Filed it with spray foam. Any suggestions on this repair/ longevity of using foam for this repair are appreciated. The path of this hole is: The metal flashing, a 2x4, finished sheet rock (no attic space in between). When the room was re-done in the past, the ceiling was taken direct to the 2x4 roof framing on that slope.

New York City coop boards are protected by the business judgment rule https://www.habitatmag.com/Archive2/209-February-2005/The-Business-Judgment-Rule Any thought of seeking a legal remedy against the board has to take this into account. Also, hiring a lawyer against your neighbors isn't a step to take lightly, since you have to live with them. The leaks may be hard to prevent when replacing a flat roof. Are your floors and possessions being damaged, or is it just that the ceiling damage is worse than you expected? If the latter, then I think you should be patient. If the former, they should help protect your stuff. This mess is the downside of living on the top floor. Assume that the board is dealing with you in good faith, unless you have good reason to think otherwise, IMO. I'm sure there's plenty of time to fight later, if they don't make good on your losses after the roof work is done. BTW, their obligations depend on the proprietary lease. They may not have to paint and restore decorative elements.

They had to remove the tile under the vinyl under the plank in my basement (if I had known the floor guys were installing the plank on top of a vinyl tile which was on top of tile I would have had them stop and remove the two layers that were there before they put the plank in!), the lower 24" of drywall, all the doors in the basement, the 3rd bathroom vanity, and the carpet in the family room area and 3rd bedroom/office/craft space when there was a pipe blockage - one small pair of child sized socks somehow managed to get flushed down the toilet in the kids' bathroom - that ended up sending water from elsewhere in the house (master bath/toilet/sink and kitchen sink water) up through the laundry standpipe in the laundry room which backs up to one of the walls down in our furnace room in such a quantity that the floor drain out of the house to the main sewer line couldn't handle it all and it wasn't 'clean' or 'gray' water. When the water heater suddenly turned into a geyser-like fountain we were able to shut it off pretty quickly and it was clean water so after mopping and wet-vacuuming plus a few days with dehumidifiers along with those giant noisy fans saved us the pain of having the newly installed drywall redone! The basement water damage we were able to file a homeowners claim on, one thing people should note is that they have the duty to mitigate the damages as soon as they notice a problem - if that means calling the remediation company first and THEN your insurer, that's how you need to do it. If you call about possibly making a claim, even if you don't end up doing so, it goes on your file because the insurer will be looking for ways to minimize how much they have to pay out on future claims. If you ask about water damage claims, but ultimately don't go forward on that claim, but down the road you have water damage from a different issue that might be difficult to get your insurer to pay out on too - they look for reasons to deny claims, they make much of their money paying out out less than they take in with premiums and deductibles. Mold is a non-covered issue (usually) if it's due to lack of maintenance or failure to address the issue at the time and where it started. They don't cover sewer main backups that originate outside of your home and the loss must be sudden and unexpected. How do I know all this? Well...The basement. :P I've probably driven the poor workers a bit mad with all the moisture readings I've asked them to take just to be sure (I know it's dry but the irrational part of me wants to be totally certainly 100% truly sure of it!) Now we're just waiting on the flooring to come in and once that's installed the whole project will be finished. At least we don't have problems with the windows down there (yet!) and they're above grade. There's good drainage away from the house outside, all we need to do is avoid further socks being flushed down the toilet! We're still not quite certain how that happened but at this point it's sort of moot and the damage done.

What part of bathroom is on the other side? A wall or shower, sink, cabinets? You could have a plumbing leak, a problem with flashing of vent pipe at roof (you'll have to go on roof), moisture coming up from the hole plumbers leave in the slab where the tub drain goes. Any pictures?