Country Club is unique in that its development has evolved over most of the twentieth century and continues today. The original 400 acres was purchased, fro the estate of John J. Reithman, in 1902 by a group of investors interested in creating a premier residential neighborhoods and an exclusive club for recreation. It was divided roughly in half, the south sector to be used for the club itself and the north to be developed into residential housing. The first development in the area was named "Park Club Place", and was situated between First and Fourth Avenues, and Downing and Humboldt Streets. To the east of Park Club Place was the Country Club area. Architect William E Fisher and Real Estate Developer Frederick Ross planned the area as an elegant Spanish Mediterranean style neighborhoods boasting enormous lots with entrance gates along Fourth Avenue. Some years later, "Park Lane Square", with gracious curving streets between Fourth and Sixth Avenues and Race Street and University Blvd, was developed by landscape architect S. R. Deboer. The Verner Z. Reed mansion on Circle Drive survives as the jewel of the area.

To the North, the area between Sixth and Eighth Avenues, commonly called North Country Club, was developed in the early 1900s. Seventh Avenue Parkway was created as a part of Denver's "City Beautiful" plan instituted by Mayor Speer around 1907. The land for the parkway was acquired as a showcase for the large variety of trees that grow in Denver.

The Denver Country Club, with its golf course and Cherry Creek flowing through it, was built shortly after the turn of the century on 142 acres south of First Avenue. Throughout the first half of the twentieth century, development surrounding the club flaunted some of the wealth of Denver. Along Alameda Avenue on the south side of the club grounds, the Weckbaugh and Moore mansions still stand as tributes to past affluence, though most of the grounds of these estates has been subdivided into much smaller, though still luxurious building sites.