chi-boulder pictures Many single tenant net lease properties can resist e-commerce and remain popular with investors.

CHICAGO—Cap rates in the single tenant net lease market have been on a long-term slide that eventually reached historic lows, but that era may be over. A boost had been expected, and in the second quarter, rates increased across all asset classes when compared to the previous quarter, according to a new report from the Boulder Group, a net lease firm in suburban Chicago.