The real estate investment trust sector is the best performer of the S&P 500's /zigman2/quotes/210599714/realtime SPX +0.48% 11 key sectors in morning trading Tuesday, as a drop in Treasury yields is helping the high-yielding sector attract buyers. The SPDR Real Estate Select Sector ETF /zigman2/quotes/207325179/composite XLRE -0.57% surged 1.3% with 31 of 32 components gaining ground. The ETF's (XLRE) dividend yield is currently 3.30%, compared with the implied yield for the S&P 500 of 1.94% and the yield on the 10-year Treasury note, which is down 2.4 basis points in morning trading, of 2.01%. The XLRE's biggest gainer is HCP Inc.'s stock which rallied 2.3%; the REIT, which invests primarily in health care assets, has a dividend yield of 4.58%. The XLRE's highest yielder is Macerich Co.'s stock /zigman2/quotes/203054096/composite MAC -5.94% , which has a yield of 9.09% and is rallying 1.8%. Among other more-active components, shares of Host Hotels & Resorts Inc. /zigman2/quotes/201760234/composite HST -0.75% rose 0.7% and yields 4.37%, Ventas Inc. /zigman2/quotes/206376229/composite VTR -4.92% gained 0.8% and yields 4.63% and Iron Mountain Inc. /zigman2/quotes/208929343/composite IRM +0.23% tacked on 1.9% and yields 7.80%. The XLRE has rallied 20.0% year to date, while the S&P 500 /zigman2/quotes/210599714/realtime SPX +0.48% has advanced 18.3%.