Well-heeled homebuyers with an interest in new condos sent Manhattan luxury sales to their best week in nearly eight years.

The dollar volume of high-end deals reached $483.6 million last week, the highest total for a seven-day period since December 2013, according to a report by Olshan Realty Inc., which measures signed contracts at $4 million and above. Sixteen of the 50 homes that found buyers were listed for at least $10 million, the biggest tally of so-called “trophy properties” since March 2013.