Retired boxer Floyd Mayweather is investing $402 million into a 1,000-unit affordable housing portfolio with Black Spruce Management in Manhattan.The deal is one of the city's biggest this year and includes more than 60 buildings in Upper Manhattan.A portion of the portfolio has already closed, with the rest expected to close in late 2021 or early 2022.In addition to this investment, Mayweather recently purchased a set of four luxury timepieces for $1 million.