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OFF: I cant help saying... if annual rent is $XXXX so I guess monthly paying is $XXXX/12=$XXX or even $XX :)[/quote]
Хехе. :lol:

Here's how my apartment lease starts, Ramil:

"1. I, referred to herein as the tenant, agree to rent from XXXXX, Inc., referred to herein as the landlord, the apt. located at XXXXX St., XXXXXX,...

I think any of these is fine, you may change them depending on context though.
In my opinion:
"Tenant" just sounds like a more professional way of saying "renter."
"Occupant" sounds a little...