Best way to invoice rent to a client?

SOLVED

We build a building. When the building is finished, we rent the building out. 

What's the best way to "invoice" this rent to the client? It seems that I can only send invoices that are linked to jobs, but the job of building the building is over. I don't want the rent for years from now to figure in job income/expenses of the original building construction. 

Service Receivables looks like it would do it, but I don't want to pay that much for the whole module when we just have one fixed amount that we bill to a dozen different clients once a month.