Ten-X's Peter Muoio Some markets have become flooded with new apartments as developers respond to demand, says Ten-X’s Peter Muoio.

IRVINE, CA—What goes up must come down, even if only slightly and gradually. After a long run well ahead of its prior peak, the multifamily sector may now be headed for a slowdown, Ten-X said Tuesday. Among other factors, the online real estate marketplace cites another wave of new supply coming this year following a record number of completions in 2016.