Los Angeles, 2018-Jan-15 — /EPR Retail News/ — Vacant office space in the U.S. increased slightly by 10 basis points (bps) during the fourth quarter of 2017 (Q4 2017) to 13 percent, according to the latest analysis from CBRE. For the year, vacancy inched up 10 bps, marking the first year-over-year increase in vacancy since…