Real estate investment trusts and sector-related exchange traded funds have been among the most popular investments in an extended low-rate environment. However, after this year’s run, REITs may be starting to look pricey.

The Vanguard REIT ETF (NYSEArca: VNQ) is the eighth most popular ETF of 2016, adding $4.6 billion in net inflows year-to-date, according to ETF.com.

The REITs sector has outperformed the broader markets. Year-to-date, VNQ rose 13.9% while the S&P 500 Index gained 8.3%. Additionally, the asset category offers some attractive yields, with VNQ showing a 3.27% 12-month yield.

SEE MORE: Preparing for Big Changes to a Popular Financial ETF

However, Goldman Sachs Group Inc. warned that the area is growing too risky for investors after the outperformance.

“Real Estate has outpaced the S&P 500 by 156 basis points year-to-date, which has hurt large-cap mutual fund returns given their underweight allocation to the sector,” Goldman Sachs analysts led by David Kostin One said in a note, according to Bloomberg.

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