This energy boom, created by the exploratory horizontal drilling and hydraulic fracturing (commonly called “fracking”) of sand and shale formations, has dramatically dropped vacancies and raised rents in all property sectors throughout states like Colorado, Pennsylvania, Texas and Ohio. And according to a new report by CBRE, commercial real estate investors are reporting double-digit returns in these exploration markets, which were traditionally seen as high-risk but are now evolving into longer-term investment horizons.