That certainly seems like one LARGE hotel room.
He obviously could afford a suite and then some.
The shooter had a “corner” room where the exterior walls (and their windows) facied in different directions. It afforded him greater fields of fire to engage a larger number of targets.
he rented two rooms, apparently not adjacent.
They have all sorts of suites if one is willing to pay more. Also, if he really was some kind of high roller there he may have enjoyed comps and upgrades, too. When I have looked at large upscale hotels online for suites (considering family stays), there are often 3-6 levels of “suite” larger than a standard hotel room.