US-listed REITs (tracked by the NA REIT index) have historically outperformed the S&P 500 over multi-decade periods (20, 25, 30, 40, and 52 years).
"the Footsie all equity REIT index, this one here, NA REIT, which tracks USlisted REITs, has outperformed the S&P 500 over the past 20, 25, 30, 40, and 52year period."