Aaaaaw...he's a cutie.
I know that when I was thinking about leasing that it was about $25.00 a ride. So if I rode twice a week it would be 200 dollars a month. If I rode 3 times a week it would be 300 dollars a month. And so on... As you can tell it was only a partial lease. The owner was crazy. She wasn't riding him, but didn't really want anyone else to ride him either. Whatever...
I had to go to the barn that he was at to ride him. I also was required to still take lessons with my instructor at the barn.
What it all comes down to is how experienced he is, who you are leasing him to, and how much his board is at the barn.
Make sure you have a solid contract. I suggest looking something up online or talking to your instructor about getting a good contract set up. I know that there are some pretty standard things in most contracts. An accident clause in case the horse or rider should get hurt. Liability waver. If anything life threatening happens to the horse that was my fault, I would have to pay for the estimated cost of the horse. In my case, $5000.00.
Just make sure that you throughly interview this person and are completely comfortable with his/her riding ability. If you are at all unsure about someone, don't do it. You can always say no. Plenty of people would love to lease a horse, do what makes you happy and your horse.
I hope I was helpful. Good luck!!!