From what I'm seeing here in Portland, the legal grow operations are locating in industrial areas close to city center, not out in the country. Commercial marijuana is grown indoors using hydroponics and artificial lights and temperature control, so the growers need access to lots of reliable electricity and reliable water. Like a data center. Also, they need security, meaning physical security, 24H video monitoring, rapid police/security response. The growers are leasing up warehouse, light industrial, commercial space, competing with creative/techie businesses in many cases.
You might want to read
Power to the pot: Marijuana growers face electric fee
Typical electric usage 360 kwh/25 sq ft
http://www.rand.org/content/dam/rand/pubs/working_papers/2010/RAND_WR764.pdf
Not sure if this turned out to be correct, but a good start to modeling out the business