Virtually everyone agrees we’ve hit a sweet spot when it comes to investment in U.S. commercial real estate assets, but you may be wondering specifically what type of real estate to invest in, as a neighborhood shopping center may offer very different returns from an apartment building. To make such decisions easier, research and valuation firm Situs RERC performs quarterly surveys of industry insiders and ranks investment conditions for various property sub-types based on their responses. The survey is based on a scale from 1 to 10, where 1 means investment conditions are poor, and 10 means investment conditions are excellent. Here are preliminary results for the most attractive assets types cited for the second quarter 2015 survey, responses for which were collected in April, May and June. Final results for the survey will be released on Aug. 10.