“The new tax isn’t causing more new sales, but is motivating earlier closings,” said the real estate appraiser Jonathan J. Miller, “essentially pulling sales that would have organically closed in July, August and September to beat the tax.”

The bevy of big-ticket transactions in June included two purchases in the villa portion of 220 Central Park South along with another in the tower portion, as well as two apartments at 432 Park Avenue and an apartment at 520 Park Avenue. Downtown there was the sale of another sprawling triplex, at the Abingdon in the West Village, and sizable penthouse sales at 150 Charles Street, the Jenga-like 56 Leonard and the Kushner Companies’ Puck Building.

Among the many other notable closings, Graydon Carter, the former editor of Vanity Fair magazine, sold his West Village townhouse. On the Upper East Side, Carl Berg, a real estate investor and venture capitalist, also sold a townhouse, while Jack Welch, the former head of General Electric, parted with a full-floor apartment. Even the United States government was part of June’s dizzying buying spree.

And now for some of the details.

Mr. Bezos’s purchase, via a limited liability company, came just four months after Amazon canceled plans to build a corporate campus in Long Island City, Queens, following a backlash over tax breaks and other incentives the tech giant would have received. Earlier in the year, Mr. Bezos and his wife of 25 years, the novelist MacKenzie Bezos, also announced plans to divorce. The three units he bought atop the 24-story 212 Fifth Avenue, at West 26th Street, presumably to combine, seem to represent a fresh start for Mr. Bezos, and at least a personal commitment to New York City.

The Crown Penthouse, as it is called, had an initial price tag of $73.8 million. It totals 10,079 square feet from the 22nd to 24th levels, with five bedrooms, five full baths and three half baths, along with a ballroom, library and private elevator, according to the listing with Sotheby’s International Realty. There are also 5,730 square feet of terraces providing park and cityscape vistas. Monthly carrying costs total $37,000.