0000034903 frt:DepositorySharesMember 2020-08-10 2020-08-10 0000034903 frt:CommonSharesOfBeneficialInterestMember 2020-08-10 2020-08-10 0000034903 2020-08-10 2020-08-10 0000034903 2020-04-02 2020-04-02 false 0000034903 8-K 2020-08-10 Federal Realty Investment Trust MD 1-07533 52-0782497 1626 East Jefferson Street, Rockville, MD 20852-4041 301 998-8100 Common Shares of Beneficial Interest FRT NYSE Depositary Shares, each representing 1/1000 of a share FRT-C NYSE false false false false false