Condominium “Units” May Include Raw Land

Q: I own several parcels of unimproved land within a condominium development. Recently, the condominium association sent me a bill for unpaid assessments, saying that these lots are considered “units” and therefore subject to assessments. I am unsure whether I am actually required to pay these assessments for my unimproved land, since it has not been developed yet. Does the fact that my land is unimproved affect whether it can be assessed, or am I still responsible for these payments? (B.S., via e-mail)