In an unexpected twist, Related Cos. elected to switch the luxury condos in MiMa, their 63-story glass high-rise on 42nd Street and 10th Avenue in Midtown West, to luxury rentals. Related planned for over 3 years to sell the 151 units as luxury condos, all located above the 50th floor of MiMa. The 663 luxury rentals on the lower stories were always been designated as rentals, but this sudden reversal to an all-rental building rather than a mixed sales and rentals building is more telling than it appears, though not in the way we might initially assume. This is not a case of desperate landlords panicking and using the luxury rental market as a safety net. Rather, this is a calculated decision based on the strengths and weaknesses of the rental and sales markets. If Related is making a smart decision, and it certainly appears that way, then MiMa's move to rental bodes well for the luxury rental market in Manhattan.