The 100 residential condominiums now sell for $750,000 to $5 million for some combined apartments.

Ms. Kramer's apartment will house the combined apartment's three bedrooms.

Within hours, they said, the landlord put under their door a floor plan showing the combined apartments.

Will we be required to get a certificate of occupancy for the combined apartment?

"You can buy two studios for $500,000 each, but you will pay $1.5 million for the combined apartment," she said.

"Most existing buildings have apartments no larger than two bedrooms except for combined apartments."

Even more significant consequences could follow when the owner attempts to sell his combined apartment.

The combined apartments will total about 2,400 square feet.

The downstairs bedrooms are set at opposite ends of the combined apartment, giving privacy to several age groups in a family.

I sold the combined apartment in 1985.