1800 sq ft Storage warehouse - advice needed

[Nida Chaudhry]

My property failed perk test, making it useless.  Cannot get it resined either so I’m only left with option to put a 2000 square foot garage on it, which is permissible as either 1 unit or more.  
I posted on FB Marketplace to check demand and was able to find people interested in paying $1200 for 1800 square foot garage.  It’s kinda on low side.  Now I’m not sure how to setup garage height .:.. it’s 30x60’ = 1,800 sq ft garage with 5 doors on longer side that I advertised.  Should I go ahead and install that?  Should I stay with standard height … I think it’s 8 ft for garage or should I get it taller?  Thinking of also getting one garage on the shorter side just to give someone more option to store .  Should I install this garage or better to split for higher?  Part of me thinks big sq ft is what makes it attractive in first place, as small storage is more common.  But then again, I’m not experienced in it, so I do need expert advise on what garage size and door size with height to pick.  Thankyou in advance.