The Main Gate and Doors with Keypads have unique numbers they use when someone calls you from there to get in. You can add these to your phone's contacts so you recognize the Caller ID instead of seeing some mystery number.
For example, when someone calls me from the front gate to let them in my phone shows: "Access Gate - Press 9"
(You press "9" to let your guest in the gate or door.)
Similarly, I have programmed the Keypad Doors as "Access Door - Press 9".
Contact Name: Access Gate - Press 9 (make this contact a company)
Contact Number: (832) 230-1975
Contact Name: Access Door - Press 9 (make this contact a company)
Contact Number: (281) 741-5060
Voilá! Now when someone calls you from the Main Gate or a Door you
will recognize the call instead of seeing a mystery number.
Try it yourself - take your phone to a door with a keypad and enter your
apartment's code on the keypad - answer your phone and unlatch the door
by pressing "9" on your phone.
Consider giving both numbers a distinctive ring-tone as well.
Watercrest uses uses several numbers to call you -
Find them here to add to your contacts so you recognize them too