Sorry Sorn if this post rambles but it has been a hectic week and I'm tired:
Yes, does each unit have a cabinet or does a single cabinet serve multiple units would be goog to know. Having a single unit demarc would be the best scenario.
Only if management disallows access to the demarc, after 7 days, no one owns the wiring inside the house but you. Its yours to cut, splice, put in your own distribution box in the garage etc... Unless, there is some covenant the owner unknowingly signed at purchase that disallows certain actions, as harshness mentioned:
Also, make sure you fully understand any agreements you have with the organization as they may be very restrictive.
Now if the house is to be sold, the prospective buyer might not be happy with your modifications even if allowed however.
The TS needs to find out from the property managers what the deal is.
Yes I agree and probably the first course of action, and hope they actually give a correct and lawful answer. Property Managers have been known to say no to things wrongfully. For example, things that are allowed under OTARD rules. In this case you can lawfully tell them to pound sand and do what you want, and there is usually not a single thing they can do about it as far as actual dish install and permission goes provided OTARD is followed..
(if not familiar, OTARD states that an HOA or management cannot prevent you from putting up a dish (up to 1 meter) or OTA antenna etc..
http://www.sbca.com/dish-satellite/SBCA_OTARD_flyer.pdf)
Ask if management has a written OTARD guide. Sometimes these guides may actually give permission to connect to demarcs along with the standard OTARD text, you may get lucky.
I have researched different written OTARD policies from different complexes and some actually specify using the provided dermarc!
Or just ask management for a key if they have one, tell them you need it to install your OTARD permitted dish.
Owner needs to find out all the details, first ask management (research their answers as they may not always be true if rejected), examine all his closing and or HOA documents if it gets that far, then make a decision from there.
How are DirecTV and Dish satellite installs handled? Have a neighbor with these services?
See how the installer tapped into the demarc. Do they just tap into the same demarc?
In any case I hope it all works out in your favor Sorn!
Let us know how it works out.