That's not how this works. As a carrier, I would always try to exhaust use of municipal or other public rights of way before dealing with a building or property owner.
Given that mmWave radios need clear line-of-sight to work properly, many 5G radios are going to end up being installed on poles. Somehow I doubt a building owner is going to match the $48 per year cost for me to rent a pole from an LDC, or $12.96 per pole per year from the incumbent.