Typically when selling on contract a seller will require 10% down, 6-7% interest, and a 3 yr balloon amortized over 30yrs. Selling on contract can be a gamble so you will want to make sure you do it correctly and find the right contract buyer.
Josh Gillum, C.D.P.E
RE/MAX Real Estate Group | The Gillum Group
6600 University Ave. Windsor Heights, IA
Licensed Realtor in Iowa
Best of success in selling your townhouse.