There's a box for "rents" in the business expenses section. I use the cd version, and there is no section for "building" rent. It's just for rents paid, and it doesn't matter what you paid the rent for. That's where you enter it.
Do note that some confuse that with a long term vehicle lease. (emphasis on "long term" like when you acquire a vehicle from a dealer for a 2 or 3 year lease.) Long term vehicle leases "are" dealt with in the business vehicle section. Rent you pay for "equipment" is reported in the business expenses section.
