In This Week’s Observer…

A former Merrill Lynch vice chairman buys a Park Avenue co-op for $5.2 million.

An ex-Lehman vice chairman takes a $1.9 million cut in selling a condo

Hideki Matsui buys a Trump penthouse for $10.5 million

Christine Quinn on property taxes, development reviews and Mayor Bloomberg.

Who gets to build something out of New York Harbor’s bottom?

Sheldon Solow to get a $250 million tax credit on his East Side mega-project.

How a normal Manhattan housing market might look.

As more sublease space hits the Manhattan office market, a question: Who will the big new leasers be?

Liechtenstein buys two Third Avenue commercial condos for $4.95 million.

Learn why 2,010 is commercial brokers’ new favorite number.

Monday Properties renews three leases at its 230 Park.

A Tribeca-Miami foodie fight illustrates the preciousness of restaurant trademarks.