You could go to the registry of deeds (online) and read the condo docs.
You will find the deed with dimensions, percent ownership, amendments to docs, rules and regs, etc.
Or you could choose a licensed professional and save a lot of time.
(Not me, I'm on the Cape, but I can help you choose a local pro if you want help doing so.)
One of the problems with sites on the Net that only sell ads or just collect email addresses to resell, is that the info on their pages is often meant to cause you to provide an email address and name or phone number for them to sell.
I'd spread the word to use actual real estate professionals' sites, rather than ones where the correctness of the data is not as important as gathering and selling your name and email to the highest bidders.
(Please note: when you choose an answer as a Best Answer, or at least give a thumbs up, it helps those who answer questions here.
Also, while I have been a VIP+ - over 1760 questions answered, over 250 Thumbs up and best answers combined - I do not try to mantain VIP status anymore.
VIP is status useless to professionals, and backwards to consumers.)