 HighTower Advisors LLC raised its holdings in shares of CoreSite Realty Corp NYSE:COR by 4.7 in the first quarter, Holdings Channel.com reports. The institutional investor owned 12,269 shares of the real estate investment trusts stock after purchasing an additional 555 shares during the quarter. HighTower Advisors LLCs holdings in CoreSite Realty were worth 1,424,000 at ... 