How to design a solution

Since your primary use case is "communal area". 

Check out these two choices

1) OrbiPro (SRK60 and RBSY50) you can have up to 5 or 6 satellites for one base. 

2)BR500+GC78XP+WAC540/WAC564 should help you do this deployment.

(Router + Switch + Access points)

OrbiPro choice : System in a box.

Key considerations are the number of clients and also what kind of VLANs or isolations you need. OrbiPro is more prosumer product and does not do VLAN based separation. But is simple to deploy and does a great job when the number of clients is less than 50.

Insight choice : (Router + Switch + Access points)

If you need full VLAN based isolations,  Then try this option.

BR500+GC78XP+few of WAC540/WAC564 should help you do this deployment.

(Router + Switch + Access points)

You have multiple choices in both GC switches and WAC500 series AP. 

You can do the deployment in many ways. Here is one of the suggestions to just give some idea.

In Insight pro account, you can create an Organization.

In the main common wiring closet.  have a BR500 and 28 or 52 port switch installed.

Run one cable to each of apartments, few to the common corridor and CCTV cameras.

Each of 13 apartments can be one location with one WAC564 AP. This will allow each tenant to have their own SSID  and 3 wired ports.

For the commonplace can be one more location, you can have BR500, 28 or 52 port switch and few WAC540 for Wifi. If need be (based off the distances the cable needs to run, you can take 8 port PoE+ switches in some of these apartment complexes).