Digital TV has been around for a number of years already, and no doubt many, if not all, of your residents are already enjoying it, either with dedicated TV sets or “set top boxes”. The only change to come will be that the analog system is being shut down.
In most cases there should be no need to change anything within the building, as existing aerials and wiring will cope. A quick survey of your residents who are receiving digital should give an indication of any problems.