Home with BMS: need new vendor

Hi all,

Apologies if this is the wrong sub but I'm at a bit of a loss. The home I purchased has a professional BMS from Brandon Controls (https://brandoncontrols.com/) that was put in during a gut renovation about 9 years ago. It uses a bunch of American Matrix controllers and runs the boilers, radient heating, heat exchangers, etc.

Unfortunately Brandon Controls has taken the change of ownership as a time to decline to service the system anymore. They've left me in a real bind, as we were discussing some modernization and upgrades to the programing. They haven't provided project files or documentation for the system, so I'm really left in a bit of a bind.

I'm in search of a company that can take this over on an annual service contract work - home is located in NYC.