The Central West End's main commercial district runs along Euclid Avenue and stretches from Forest Park Parkway on the south to Delmar Boulevard on the north. Many new residential and commercial developments have appeared along Euclid Avenue in recent years, and the building boom shows no signs of slowing down. These modern developments mix with elaborate, turn of the 20th century details, such as lamp posts and cobblestone streets, to create a unique atmosphere in the neighborhood - which first grew in popularity during the coming of the 1904 World's Fair, held in the adjacent Forest Park. Some residential areas of the Central West End are included in the National Register of Historic Places. One example is Fullerton's Westminster Place, whose large, architect-designed homes, most of which were built in the period 1890–1910, were described in the NRHP nomination as one of the finest turn of the 20th century streetscapes in the United States. Another is the private place called Washington Terrace, laid out in 1892. There are also more modern residential buildings that can be found in Central West End, including Park East Tower and One Hundred, which will be the tallest building in Central West End once it is completed in summer of 2020.