Orange County Tax Foreclosure Real Estate Auction. The next tax delinquency auction has not been scheduled yet.Typically, once a year between August and November Orange County holds a Deed Sale. Auction. Maintaining accurate, legible and complete tax maps identifying the parcels of land in the City. The continual Review of Property Cards to ensure accuracy. Use the downloadable, barcoded PDF document for transfers of Real Property located in all counties except: Herkimer County and the boroughs of New York City. When funds are tight, these 5 low and no cost house selling methods will help you sell your Orange County home in no time! Customer: I'm in Orange County, NY. We bought a piece of property and built a house on it. The Treasurer-Tax Collector annually offers for sale, real property located in the County of Orange. If you receive a Change of Ownership Statement (COS) in the mail, you must complete and return it to the Assessor Department within 90 days to avoid penalties.