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This small residential district consists of the east side of San Juan Avenue for the full block and a single house on the northwest corner of 6th Street. One- and two-story masonry houses built between 1896 and 1905 represent a gamut of historical vernacular styles, with uniform setbacks, low retaining walls along the sidewalks, mature trees, and a single remaining stone hitching post disguised as a tree stump. The houses at 509, 521, and 522 San Juan Avenue were designed by John Gwyn, a local architect also responsible for the Chestnut Apartments (1908) at 4th Street and Santa Fe Avenue.