I was thinking the exact same thing for my 4 unit building. We have spectrum but was thinking it might be best to get FIOS. The big advantage is with FIOS you get upload AND download speeds that are very fast. Uploads speed is important if you do any online backups or sharing and don't want a backup to take 2 weeks. Normally each subscriber has to find a place to put those big boxes that convert the fiber to copper. Instead of having 4 of those bulky things - 1 in each apt, we could have one and put it in the basement. We would ensure privacy by getting a static ip address for each unit and a separate router for each unit. You may as well get the TV and phone package and get ALL the premium channels cause we would split the cost 4 ways. Could provide building wide WiFi as well and integrate with cameras and such. I was thinking of just calling the business office and get an account under the HOA name. Only problem is two of the unit owners will flat out go against any idea I contribute, no matter how much benefit or savings it would provide them.

Spectrum will do bulk packages @ 50$ish per participating shareholder.

But there are so many advantages to a single building wide network that I still would favor it.