Rose Associates, a New York-based multifamily property manager, has more than 40,000 units under management. It’s already one of the largest firms in the region, but it's not stopping there. The firm is rapidly expanding its presence throughout the Northeast — going from about 2,000 units outside of the city to just under 10,000 in a few years, said Lindsey Geitz, multifamily director at Rose Associates.  Geitz said Rose has noticed shifts within the northeastern multifamily market, particularly in the luxury segment. Residents now expect building management to take a hospitality-driven approach, placing an emphasis on personalized service, amenities and community engagement. Management...