It depends on the high-rise.
If a 10-76 is transmitted for a Commercial High-Rise, the response is:
4 Engines
4 Trucks
1 CFRD Engine, 1 Lobby Control Engine, 1 FAST truck
4 Battalion Chiefs, 1 Division Chief, Rescue Battalion, Safety Battalion
1 Battalion Chief as the Safety Officer
Tactical Support Unit, FieldCom, nearest High-Rise Unit, Rescue, Squad, RAC unit, Mask Service Unit
A 10-77 for a High-Rise OMD is similar:
4 Engines
4 Trucks
1 CFRD Engine, 1 FAST truck
3 Battalion Chiefs, 1 Division Chief, Rescue Battalion, Safety Battalion
1 Battalion Chief as the Safety Officer
Fieldcom, Rescue, Squad.
Should a 2nd alarm be transmitted for a 10-77, the remainder of the units called on a 10-76 (e.g. High Rise Unit, MSU) are assigned in on the 2nd alarm.
The High-Rise Units carry a variety of tools including High-Rise Fans, lights, and generators. High-Rise 1 is quartered with Engine 3 and is staffed by the Engine when needed. Likewise, High-Rise 2 is quartered with Engine 39.