The FRED series Total Credit Market Debt Owed by Domestic Financial Sectors - REITs is now known as Real Estate Investment Trusts; Credit Market Instruments; Liability.
The source series id is FL644104005.Q.
The series previously appeared in Table L.1. For further information see the assistance provided in the guide to the Financial Accounts at http://www.federalreserve.gov/apps/fof/.
Board of Governors of the Federal Reserve System (US), Real Estate Investment Trusts; Credit Market Instruments; Liability, Level" [REITTCMDODFS], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/REITTCMDODFS, April 21, 2018.