Sales on a per-square-foot basis have declined for three years.

The price was more than twice the going rate for land in Manhattan on a per-square-foot basis.

Over that time period it has become extremely successful, the center claims to hold some of the highest performing stores on a per-square-foot basis for many national retailers.

The price is higher, on a per-square-foot basis, than most town houses have commanded in the neighborhood.

"On a per-square-foot basis, we did more business than any record store in the world," he declared.

Q. Many advertisements for apartments in New York include the price on a per-square-foot basis.

Mr. Hyman, like many deck contractors, charges on a per-square-foot basis, based on the material used.

The tie is universally considered the highest-profit menswear item in any store, on a per-square-foot basis.

"A construction lender looks at costs at a per-square-foot basis all over the country," Mr. Fraser said.

"It's the most expensive real estate in the world, if you figure it on a per-square-foot basis," he said.