Retired boxing legend Floyd Mayweather Jr. is pulling no punches when it comes to New York City real estate. Over the weekend, the undefeated athlete posted a victorious carousel of photos and videos on his Instagram account, flaunting his knock-out purchase of a massive multi-family portfolio in Upper Manhattan. It’s far from his first-ever foray into the world of property. The Post’s Gimme Shelter chronicled his lush New York house hunt late…
