Trammell Crow Co. (214-863-3000) announced that Whitney Knoll topped the $1 billion mark in sales. Knoll has participated in the sale or financing of a portfolio of more than 100 retail shopping properties in the Southeast.

Spiegel Group, Inc. (630-986-8800) announed that its chief executive, Martin Zaepfel, is retiring and being replaced by a turnaround expert, William Kosturos. Zaepfel had been with the company since July 2001. Kosturos’ advisory assignments with Alvarez & Marsal include PG&E Corp., Webvan Group, Inc. and Covad Communications Group, Inc.