I have been a real estate lawyer for almost 25 years, now, and the only time that I have ever heard of the term 'cap' is in relation to adjustable rate mortages (ARMs), which sometimes have 'caps' for the maximum amount of interest that can be charged.
But looking at the way that law firm specified its bill - it may have something unique to do with the type of housing that you sold.
Was it a condominium? That could explain the 'Common Areas....', or the 'CA' of the 'CAP', and the fact that a 'Board' was involved.
Condo regimes are run by Boards, usually, and this could stand for some formula for determining common area assessments, etc.
Call the law firm and ASK what the 'F' they mean in their bill!
I'm certain they will be happy to explain it!
And then send you another bill for their time in explaining the previous bill!
Eric The(NowYouSeeWhyLawyersAreSoPopularWithFolks!)Hun