Ingleside Terrace Historic District consists of one- and two-story, detached single-family houses that exhibit architectural styles such as Craftsman, Period Revival, Spanish Colonial Revival, and Mediterranean. The Ingleside Terraces housing tract occupies the former site of the Ingleside Racetrack, and the elliptical shape of Urbano Drive corresponds to the former loop of the horse-racing track. From 1910 to the 1920s, Ingleside Terraces was constructed by the Urban Realty Improvement Company as a "residence park" for high-end homebuyers. In addition to houses designed according to specific guidelines, the residence park of Ingleside Terraces includes curvilinear streets (such as Urbano Drive), non-rectangular blocks, landscaped open spaces (circular mini-parks), and ornamental street furniture (granite entry monuments, stone benches, column planters, and a sundial). The Urban Realty Improvement Company was headed by Joseph A. Leonard, and later by his son George L. Leonard, both of whom lived in Ingleside Terraces until the elder Leonard’s death in 1929. Ingleside Terraces represents Joseph A. Leonard’s most successful garden park development in San Francisco, as well as one of the best examples of a residence park in the City. Ingleside Terraces eligible for the California Register under Criterion 1 for its association with the residential parks development that occurred in the early 20th century and under Criterion 3, as exhibiting the distinctive characteristics of a type, period, region or method of construction of residential park. Ingleside Terraces exhibits the characteristic features of residence parks of that era including curvilinear streets, ornamental street work such as plinths, urns, gates and fountains and, uniquely, its sundial.