The insurance and mortgage companies should have been interested in the information but I doubt whoever had the information would have thought to contact them a

The insurance and mortgage companies should have been interested in the information but I doubt whoever had the information would have thought to contact them and, even if they did, I doubt the companies would have had a reliable process for receiving and investigating that sort of “whistleblower” claim. It’s even more complicated when it’s a condo building and there are any number of different banks and insurers involved, rather than just one. Everyone assumes someone else is looking at X and so they all ignore it a bit more than they should. But, if you’re looking for the business niche, I’d guess they’d be your customers. Basically a “bug bounty” program for underwriters of tenancy in common real estate.