CHICAGO—The single tenant net lease big box sector saw a significant shift in 2015, according to the latest report from the Boulder Group, a net lease firm based in suburban Chicago. Cap rates compressed from the fourth quarter of 2014 to the fourth quarter of 2015 by 63 bps to 6.08%. That decline was steeper than seen in the entire net lease retail sector, which compressed by only 25 bps during the same period. This represents the first time since 2010 that the big box sector was priced at a premium to the entire retail net lease market.