Investment manager Joseph Stilwell has bought an $8.5 million condo at the Plaza, city records show. Mr. Stilwell is one of the largest shareholders of Cameron Financial, a U.S. home-lender established in 1887.

Internet advertising wunderkind Scott Ferber has shelled out a little over $5 million for a condo at the Plaza, city records show. Mr. Ferber sent shockwaves through the technology industry when he sold his cash-strapped Maryland-based firm Advertising.com to AOL Time Warner for $435 million in "one of the most successful exits in the on-line advertising market."