Investors continue to find ways to pick up entire suburban Chicago condo complexes and turn them into more profitable rental properties even as such deals become more difficult in the city.

The latest example is the Terrace of Elk Grove Village, a 427-unit property west of O’Hare International Airport, at 908 Ridge Square, which just was bought from condo owners by Deerfield-based United Group Development for $57 million, Crain’s reported.