Are you preparing for popular streaming video products pushing 4K content?
A popular model is to use wireless until enough you have enough customers in a building to justify building out fiber so you can supply more bandwidth. Even without fiber you could have a 50 unit building with half the units streaming 4K@30Mbps simultaneously and have enough bandwidth left over for typical web use.
I wouldn't be surprised if they have buildings fed with 1x1Gbps going to 40x1Gbps clients.
(hand waving about Erlangs and queuing theory here) E.g. if you assume everyone is downloading a DVD image from a fast mirror (CentOS install DVD or something), they probably won't all start the download at the same time so there's a really good chance one user will finish their download before someone else starts theirs.
My MDU users rarely crack 1Mbps on a 30-day 95th percentile basis.