Is your mare also stabled at the friend's farm? As you are uncertain about whether she is pregnant or not I do hope they are experienced in the control and containment of studs, especially one so unusually large for his breed.
That has to be the tallest QH I've ever heard of. What will you being doing with this new horse?
I went to get a horse a friend purchased and the owners of the facility (nice place) showed me around a bit. They had a 17.1hh Quarter Horse gelding. He. Was. HUGE! I'd never seen one, never have again either. I think they were being modest when they said 17.1hh also as the horse we picked up was a 16.3hh Thoroughbred and he looked small. Although, that was in part due to the bulky size of this super sized QH. AQHA papers on his stall and all. They're quite proud of him.
Bell is on our farm and Mike has the facilities to keep a stallion he has a few and he wants to geld them. (his studs are the sons of hercules) I think Marvin the owner of hercules is selling B.J Jet Fuel and Baby Jet (Weanling filly the size of a yearling!!) with him I don't know but B.j was Boons friend. (Boon was my horse that passed)