Need alternative solutions for routers and access points for three floors with 50,000 sqft for all three floors. Also, need to to determine if 2.5GHz and 5GHz is the better solution.

Bandwidth Estimate:
1st Floor 40 desktops; 40? VoIP phones;
8 AP’s (Approx 25 users each = 200 Users) ? Total Max = 200 Users / 3 Shifts = Approx. 67 Concurrent Users @ 50 Mbps/avg (Critical, Medium – High Vol Traffic)
2nd Floor 256 Desktops; 272? VoIP phones
/ 2 Conf Phones; 16 Network Printers; 2 Large Conference Rooms Total Max = 500 Users / 3 Shifts = Approx. 167 Users @ 250 Mbps (Critical, Heavy Vol Traffic / Call Center / Sales)
3rd Floor 204 Desktops; 204 VoIP phones
/ 4 Conf Phones; 20 Network Printers; 4 Large Conference Rooms – 2 AP’s? Total Max = 403 Users / 3 Shifts = Approx. 134 Users @ 205 Mbps (Critical, Heavy Vol Traffic / Top Mgmt)