Need help with plumbing

[Harish Nandipati]

One of my units in a 6-plex in Tucson, AZ has clogged drains. The plumber tried to snake it out but he couldn’t. He tried to scope to see what’s going on but he couldn’t see. He thinks there is probably some leak or pipes may be dissociated, he is now suggesting to open the floor and put new copper tubes if needed. He gave me a quote of roughly 2400$ just for this and I have to pay the handyman for fixing the floors later. He is also suggesting to hydro jetting of the drains for other units because he saw roots in some of the drains . He is quoting 250$/hr for this work and he is not clear how many hours the work would take . 

Please advise me whats the reasonable charge for this kind of repair?

Thank you so much