“In all my years of doing this,” she added, “I have never seen such a hunger for New York City real estate.”

Other market reports using different numbers and methodologies put the overall average price just shy of previous records, but a number of reports posted records in a variety of categories. The average price of new development and resale condos reached a new high of $2.41 million in the second quarter, according to Douglas Elliman. Reports by Halstead Property and Brown Harris Stevens noted that prices of resale apartments broke new barriers for the same period, and put the average price of resale apartments at $1.57 million and the median price at $920,700.

The higher prices were driven by two key factors. Inventory growth has begun to stall, especially in the resale market, where potential sellers are reluctant to list their properties as they are often outbid, turned down for loans or simply cannot find what they are looking for. The number of available listings barely budged, up 1.3 percent in the second quarter to 5,730, compared with a year ago, according to Douglas Elliman.

At the same time, most of the fresh listings making their way onto the market are coming from new developments, which have primarily offered larger residences at higher prices. “Many of the developers were very smart in the type of product they brought to the market,” Ms. Leibman said. “Developers helped to create and fuel the demand by offering these high-end luxury condos with views and amenities, and foreign buyers in particular have really responded. Everybody keeps raising the bar.”

The rising prices have also contributed to a drop in sales, said Diane M. Ramirez, chief executive of Halstead Property, which found that the number of reported closings declined 10 percent to 2,430 in the second quarter from the same period last year. “Sellers are holding firm in their price, and buyers are only going forward if the price makes sense to them,” Ms. Ramirez said. “So you are seeing fewer closings.”