A company tied to Jeffrey Herz parted with a penthouse at 224 Mulberry Street for $16.3 million. The duplex spans 5,600 square feet, pricing the sale at $2,900 per square foot. The buyers were LMXD and BedRock Real Estate Partners, who plan to construct a 560-unit, mixed-income project on the site. The residence measures 3,100 square feet; the deal breaks down to $2,300 per square foot. The property measures 29,000 square feet.