Park Heights Avenue becomes a four-lane undivided highway shortly before Belvedere Avenue, where the highway passes the western edge of Pimlico Race Course, the site of the Preakness Stakes.
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MD 129 passes along the edges of the pentagonal block that contains St. Mary's Park, St. Mary's Seminary Chapel, and the Mother Seton House, which along with nearby Orchard Street United Methodist Church lie within the Seton Hill Historic District.
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As Park Heights Avenue, the state highway is one of two primary radial routes (with MD 140) in the northwestern part of the city, providing access to The Maryland Zoo and Pimlico Race Course.
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