wonky neighborhoods that isn't often referenced" because of its small size. After further spates of development (encompassing Brooklyn Real Estate Exchange President Jeremiah Johnson, Jr.'s circa 1891 Kensington Heights and circa 1894 Kensington-in-Flatbush developments, the former in the vicinity of Ditmas Avenue and the latter possibly in the vicinity of Church Avenue; detached suburban villas on and adjoining Ocean Parkway that attracted wealthier residents from more urbanized areas, including Brooklyn Heights, Bedford-Stuyvesant and Bushwick; hybrid commercial/walk-up apartment structures on commercial thoroughfares; and a variety of limestone- and brick-fronted townhouse rows), mass homebuilding began in earnest in the 1920s, attracting many European and Middle Eastern immigrants to the neighborhood. Earlier structures often coexist with relatively modest single- and multi-family frame and brick homes (usually detached or semi-detached and featuring yards and garages) from this period. Apartment houses (ranging from four-story walk-ups to more exclusive six-story elevator buildings) became increasingly prevalent on upper Ocean Parkway and in its periphery as the IND Brooklyn Line was constructed in the early 1930s, replacing many of the suburban villas. Following World War II, the development of the Prospect Expressway ensured that luxury buildings (by now often exceeding six stories due to building code revisions and zoning changes, as exemplified by the Marlene J. [later known as the Caton Towers] and the Americana Towers) continued to be developed on Ocean Parkway and in its immediate vicinity until the mid-1960s. Since the 1990s, there has been a notable resurgence in various forms of residential development, including new apartment houses on Ocean Parkway and smaller structures on side streets. Throughout much of the 20th century, Kensington was seldom distinguished as a distinct neighborhood, with many residents and demographers identifying the area as the western section of Flatbush. The descriptor West Flatbush was also used by various religious & civic organizations and urban planners in the first half of the 20th century before largely falling into disuse in the postwar era. While the Kensington moniker continued to be employed by branches of certain governmental institutions (including the Post Office Department and the Brooklyn Public Library), it was also used by demographers to differentiate the largely working class, ethnically heterogeneous tracts west of Ocean Parkway (then an upper middle class, predominantly Jewish American enclave roughly situated between the well-heeled residential thoroughfares of the Upper West Side and the more steadfastly middle class Grand Concourse in socioeconomic standing among New York