Data center REITs drove the S&P 500 real estate sector lower this week amid the rise of the Chinese AI startup DeepSeek, which dragged technology stocks down, and the weekly earnings failed to impress. The Real Estate Select Sector SPDR Fund ETF (NYSEARCA:XLRE) declined 0.38% for the week to close at 41.42, while the broader S&P 500 index fell by 1…