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In this chart, I track total inventory in the orange columns, with the month of September in orange. I was trying to illustrate the change in inventory from August to September, which increased in 5 of the past 6 years and suggests a seasonal change. In addition, co-ops (blue line) and condos (green line) track separately until the summer of 2006, when they aligned. Condos seem to be edging out co-ops now despite the fact that the owner-occupied housing stock is 3:1 (co-op to condo).
· Manhattan Co-op and Condo Listing Inventory [MillerSamuel]