iShares core lineup continues to be a big hit with investors. The suite of large, easy-to-understand indexes and ETFs has racked up some major dollars from both retail and institutional investors. What was missing from the lineup was a broad way to invest in real estate. But rather than launch a new fund, BlackRock decided to take the iShares Real Estate 50 ETF ( FTY B+ ) and change it slightly. The iShares Core U.S. REIT ETF ( USRT A- ) will drop its expense ratio to just 0.08% and change the index to a broader mandate: the FTSE NAREIT Equity REITS Index. Instead of tracking just the 50 largest REITs in the U.S, it will now track all of them. In the end, the changes should breathe new life into one of iShares smallest real estate funds. Want more information on iShares and its core lineup's low expenses? Check out BlackRock Lowers Expenses for 15 ETFs.