Cap rates in the single tenant net lease big box retail sector increased from 6.75% in Q4 2017 to 7.04% in Q4 2018, driven by investor concerns over retail environment changes and store vacancies from retailer bankruptcies; investment grade rated big box tenants commanded a 68 basis point premium over cap rates for non-investment grade tenants; the report provides data on median asking prices, cap rates, and recent transactions for net lease big box properties in Q4 2018.