Sub-series 3, Real estate, 1837-1941, contains an abstract of Fish land holdings on 6th Street to 9th Street between Avenues C and D in Manhattan. Minutes, audits, rental assessments, and a rent collection ledger for 194-196 East 3rd Street in Manhattan are included under the Petersfield Realty Firm. A deduction of title and map of the Petersfield Farm area of Manhattan, now the Gramercy Park neighborhood, is also included in this subseries. While there are deeds, mortgages, and titles in sub-series 1, they deal with property owned or lived on by the Fish family. The items in this sub-series constitute land that was rented or sold by the Fish family through the Petersfield Realty Firm.