The pace of home sales over the past year shows there is a glut at the high end of the market in New York City and surrounding areas. Properties with the highest prices — those in the top 10 percent — are taking longer to sell.

According to information provided by Jonathan J. Miller, of the real estate appraisal firm Miller Samuel, it would take nearly 16 months to sell all the high-end units listed in Manhattan as of the second quarter of 2018 — about a 33 percent increase over the pace a year earlier , when all the properties in the same price range would have taken just under 12 months to sell out.

In comparison, at the current rate of sales, the other 90 percent of the listings in Manhattan would take less than half that time to sell, or about seven months, up from roughly five and a half months a year earlier.