Tree-lined blocks shade pricey new builds and some enduring ranch-style homes—almost exclusively single-family—in this neighborhood just east of the University of Denver campus. At its core is Observatory Park and the school’s Chamberlin Observatory, a Romanesque structure that’s listed on the National Register of Historic Places. The wide streets and grassy lawns make it a pleasant place to walk, and there’s easy access to I-25 and, for bikers, the 2.4-mile East Harvard Gulch Trail. University Park Elementary School also earns high marks.