ULA's lease on SLC 37 is up next year and SpaceX would like to take it over for Starship Heavy launches. If it happens, that would mean four towers. Two at Starbase, Texas and two at Cape Canaveral, Florida.
SpaceX wants to take over a Florida launch pad from rival ULA
SpaceX now plans at least four Starship launch pads: Two in Texas and two in Florida.
arstechnica.com
If SpaceX isn't cleared to use SLC-37, the company could build a brand new launch pad designated Space Launch Complex 50. If this is the path SpaceX takes, SLC-50 would be built on undeveloped land north of SLC-37 and south of SpaceX's primary launch pad for the Falcon 9 rocket at Space Launch Complex 40.