In pre-inkjet days there was a franchise that made huge enlargements from small amateur film at very reasonable cost called Bigshots, if I recall correctly. They attached a box-like tower to the side
of the building reminiscent of a grain silo to get the necessary vertical distance in a small lease space. The better pro labs simply used a big floor space and horizontal enlarger on tracks, since they
had to accommodate a variety of films, including large format pro sheet film. Most enlarger lenses are
not intended for significant magnifications. A notable exception would be the Rodagon G.