Check Baja storage out of CA. on the web. The demand is for 14x40 and 14x50 enclosed with 14high by 12 wide doors. rent is 30 to 35 cents per square foot per month. Do a years lease with monthly payments or a discount for full years rent. You need at least 80 foot of drive/turnaround for a 50 ft bay. You can angle them at about 30 dregrees to cut down on lot required. Also check out Kirby Building. Land cost needs to be less than 40K per acre to cash flow.