Guess who's dropping big money to keep millennial workers happy?

If you guessed Blackstone Group, Brookfield Property Partners and Boston Properties, you'd be right; the major commercial landlords are investing big to stave off the WeWorks of the world and keep millennial workers in their offices. Without altering office to include the perks of a gym, free in-office cafes and bars and a flexible, open-concept layout, these landlords don't believe they can hold on to tenants, according to Bloomberg. “The way towers were built in the 1980s, they were a monument to the corporation,” says Lisa Picard, CEO and president of Blackstone's Equity Office. “Now, if it feels corporate, that’s the kiss of death.” The numbers support her theory: Colliers' research team noted vacancy rates were up to 11.5 percent in Boston last year in the fourth quarter while in Manhattan, the firm expects about 8 million square feet to be vacant in the coming years. To keep old tenants and attract new ones, landlords are getting creative: Boston Properties reportedly dropped $100 million to renovate 399 Park to include bike valets among other new features, while Brookfield's tenant JPMorgan Chase is renting new space for its software engineers in 5 Manhattan West which will be outfitted with soundproof rooms for playing music or games. [Bloomberg] — Erin Hudson