NEW YORK – In terms of living icons in the real estate business, billionaire Sam Zell is viewed as the tops, according to respondents to a survey conducted by Globest.com.

MINNEAPOLIS-Sources say the developer bought back at a gain, after selling the 700,000-square-foot Fifty South Sixth office building to KanAm Grund for $193 million.

CHICAGO-The derivatives clearing organization cut a deal to drop from 70,000 square feet to 58,000 square feet, in return for a 10-year renewal at One N. Wacker Dr. in the West Loop.

NEW YORK CITY-Halstead Property, a residential brokerage firm, is increasing its headquarters space.