Chicago Great Western Railroad-Waterloo Freight Depot

The Marsh–Place Building at 627 Sycamore St. in Waterloo, Iowa is a six-story building built in 1910. According to its nomination to the National Register of Historic Places, it is notable as "a distinctive, virtually unaltered example of the Commercial Style". And it is an "excellent" example of "the three-part base-shaft-capital approach (similar to a classical column) to tall building design.": 5, 8 It is a work of architects Hallett & Rawson. It was individually listed on the National Register of Historic Places in 1998. In 2011 it was included as a contributing property in the Waterloo East Commercial Historic District.

The Fowler Company Building is a historic building located in Waterloo, Iowa, United States. It was built in 1884 by the city's most successful grocery wholesale business. They continued to operate from here until 1937. The three-story brick structure is an example of Late Victorian commercial architecture with Queen Anne influences. The building features pilasters, corbeling, canted-brick courses, and contrasting stone trim around and between the windows and at the street level. It is capped with an ornate metal cornice that contains pilasters, finials, pediments, floral and circle imagery, and quilted surface textures. It was individually listed on the National Register of Historic Places in 2009. In 2011 it was included as a contributing property in the Waterloo East Commercial Historic District.

The Waterloo East Commercial Historic District is a nationally recognized historic district located in Waterloo, Iowa, United States. It was listed on the National Register of Historic Places in 2011. At the time of its nomination the district consisted of 36 resources, including 28 contributing buildings, and eight non-contributing buildings. The city of Waterloo was established in the early 1850s. Its first settlers started developing the west side of the city before crossing the Cedar River and developing east side. The first Black Hawk County Courthouse was built on the east side in 1856 and East Waterloo Township was created two years later. As industry began to develop along the river, and the arrival of the first railroad in 1861, the commercial district on the east side began to grow. Also on the east side of town was the terminus of the streetcar-turned-interurban system. By 1900, the city became one of the primary wholesale and retail centers in northeastern Iowa. In 1911 the Black population increased significantly as workers, primarily from Mississippi, moved into town to work for the Illinois Central Railroad. The following year the saloons in town were closed and bootlegging, gambling, drugs, and prostitution started to increase in the area surrounding the central business district. All of these developed put together created the atmosphere of the downtown commercial district. For the most part, the commercial buildings in the district are constructed of brick and are two to three stories in height. There are also several taller multi-story buildings located here, and they represent the "high water mark in the district’s physical development." All of the buildings follow the styles popular at the time of their construction, including Italianate, Neoclassical, and Commercial. Architects who have buildings in the district include John Bartley, John T. Burkett, Howard B. Burr, Mortimer Cleveland, George Ellis, Hallett & Rawson, Emile G. Jehle, Josselyn & Taylor, Joseph C. Llewellyn, John G. Ralston, Fred G. Shaw, and Clinton P. Shockley. Fires in the 1920s and 1950s impacted the appearance of the district as most of the fire-damaged were given stylish new facades. Several other buildings were given updated facades in the 1940s and the 1950s. The buildings that do not contribute to the historic integrity of the district had their facades resurfaced in more recent decades. The Fowler Company Building (1884) and the Marsh-Place Building (1910) are individually listed on the National Register of Historic Places.

The Waterloo Public Library-East Side Branch is a historic building located in Waterloo, Iowa, United States. The public library was established here in 1896. It operated out of two rented rooms, one on the east side of the Cedar River and other on the west side. The Carnegie Foundation offered a grant of $30,000 to build a new library, but disagreements erupted over whether to place the building on the east side or west side of the river. They then agreed to grant $40,000 for a mid-river building, or the same amount for two buildings. In the end they agreed to grant the community $24,000 to build this building and a similar amount for the west side branch. Waterloo architect John G. Ralston designed both buildings in the Neoclassical style. Both were dedicated on February 23, 1906. The single-story Bedford stone structure was built over a raised basement. It is one of the few stone buildings in Waterloo. The building has a central portico with paired Ionic columns. It is part of a larger central mass that is oriented from front to back and sits across the lower hipped roof. In 1977 voters in Waterloo approved a $3,650,000 bond referendum to renovate the city's 1938 post office and federal building to house the library. The post office vacated the building in 1979 when it relocated. The old library building was listed on the National Register of Historic Places in 1988. The building is now used by the city of Waterloo.

The Hotel President, also known as the Park Towers Apartments, is an historic building located in downtown Waterloo, Iowa, United States. The building was completed in 1929, and it opened as a "showcase hotel." In 1948, Paul "Pinkie" George and five other wrestling promoters from the Midwest founded the National Wrestling Alliance in the hotel. The manager of the hotel at the time was Lark Gable, the grandfather of Olympic gold medal winner Dan Gable. Various companies owned and operated the hotel until it was acquired in 1968 by Elders Inc., a nonprofit group of churches. They converted the building into subsidized housing. It was bought by local developers Brent Dahlstrom and Jim Sulentic in 2011 and they sold it to Huntley Witmer Development of Los Angeles. Huntley Witmer spent $12 million in 2015 renovating the building that continues to house 84 units of federally subsidized housing. It was listed on the National Register of Historic Places in 2017.

The Waterloo Masonic Temple is a historic building located in Waterloo, Iowa, United States. The first Masonic lodge in town, No. 105 A.F. & A.M, was established on the west side of the Cedar River in 1857. Lodge No. 296 was organized on the east side of the river in 1871, and the two consolidated into one lodge eight years later. They built their first Masonic Temple in 1899 at the intersection of Sycamore Street and East Park Avenue. The city was in the midst of a period economic growth that would see its population double each decade from 1890 to 1910. By 1918 the Masons felt the need for a new facility. Property at the intersection of East Park Avenue and Mulberry Street was acquired in 1920. Local architect John G. Ralston, a fellow Mason, was chosen to design the new building in what has been termed the "Phoenician Revival" style. The exterior walls were completed in 1925, but the interior wasn't completed until 1928. It is a four-story structure built over a raised basement. Its exterior walls are composed of dark red brick accented with light grey limestone. The main façade features a central entrance pavilion with three entrance ways that terminate in Moorish peaks near the roofline. Various Masonic symbols are found carved into the stone, and decorative brickwork flanks the central stone pavilion. The building was listed on the National Register of Historic Places in 2013.

KBOL-LP (100.1 FM) was a low-power FM non-commercial radio station, which broadcast an urban contemporary music format. Licensed to Waterloo, Iowa, United States, the station was owned by The Community Outreach, Inc.

Fire Station No. 2, also known as El Mecca Shrine Club, is a historic building located in Waterloo, Iowa, United States. The city's paid fire department dates from 1904. Prior to that Waterloo was served by private fire companies. Built in 1907, this is the only early fire station left in the city. This building is an eclectic combination of the Renaissance Revival and the Romanesque Revival styles. It was designed by the prominent Waterloo architect John G. Ralston. The decorative elements on the main floor are found in the columns with foliated capitals that support a broad entablature. The second story is primarily brick with lighter stone accents for a polychromatic effect. The building was used as a fire station until 1969 when the city built five new stations. Black Hawk County used the building as an office to issue food stamps. El Mecca Shrine acquired the building in 1976 and converted it into a restaurant and club. It was listed on the National Register of Historic Places in 1988.

The Hotel Russell-Lamson is a historic building located in Waterloo, Iowa, United States. Clyde O. Lamson, a real estate developer, and his wife Lillian Russell Lamson were instrumental in the construction of the hotel. Completed in 1914, it uses their family names for its name. The Chicago architectural firm of Marshall & Fox designed the eight-story Georgian Revival building. It utilizes the base-shaft-capital configuration that is typical for this building type. The base is composed of rusticated Bedford limestone, which extends to the mezzanine level. The shaft is six floors of red brick veneer. It contrasts with the limestone trim. The capital is a rather simple cornice composed of moldings and a row of dentils. From 1919 to 1921 the hotel became the home of the Greater Waterloo Association. It was the result of a merger of four organizations that had worked separately to improve and develop the city. Black Hawk Broadcasting Company established radio station KWWL in the hotel in 1947, and television station KWWL in 1953. Studios for both stations were located in the hotel until 1958. The building was listed on the National Register of Historic Places in 1988. The 250-room hotel has been converted into a 90-unit apartment building.

The YMCA Building is a historic building located in Waterloo, Iowa, United States. The local YMCA was established in 1868, three months after the city was incorporated. Its first permanent building was built at this location in 1893. As membership expanded they eventually out grew the building, and it was torn down in 1930. The present building was designed by local architect Mortimer Cleveland and his associate D.B. Toenjes. The general contractor was H.A. Maine Construction. The three-story brick structure features decorative elements from the Art Deco mode. The first level has housed commercial firms in the storefronts. An addition was built onto the west side of the building in 1959 to house adult activities. The local YMCA built a new facility and moved from here in 1982. The following year the building was listed on the National Register of Historic Places. It has been converted into an office building.

Grace Methodist Episcopal Church, also known as Mount Moriah Missionary Baptist Church, is a historic building located in Waterloo, Iowa, United States. The congregation that built this building was organized in 1861 as First Methodist Episcopal Church. They built church buildings in 1865 at Lafayette and East Fifth Streets, and then at East Fourth and Mulberry Streets in 1877. They changed their name to Grace in 1895. They completed this building at Walnut and East Fifth Streets in 1913. The brick, Neoclassical structure designed by Turnbill & Jones features a large central dome and a large classical portico with six Ionic columns. Mount Moriah Missionary Baptist Church acquired the building from Grace United Methodist in 1996. The building was listed on the National Register of Historic Places in 2011.

Walnut Street Baptist Church is a church building in downtown Waterloo, Iowa, United States. It has also been known as Faith Temple Baptist Church. Built in 1908, it was designed for its triangular lot by Waterloo architect Clinton P. Shockley. Although the main exterior materials are merely brick plus stone and concrete trim, the building reflects multiple architectural influences:The building exhibits the influence of a combination of contemporary architectural styles and trends of the early 20th century including the English Arts and Crafts movement and the Chicago School with minor indications of the academic tradition of the Beaux-Arts.: 5  Clinton Phillip Shockley began his architectural practice in 1906. This was an important work for him. He and Mortimer Cleveland were "by far" the most qualified architects in Iowa and were able to win contracts that would previously have gone to non-Iowa firms.: 15 The Walnut Street Baptist Church congregation worshiped in the facility from its construction until 1970. The congregation was an early leader in the General Association of Regular Baptist Churches. Upon relocating to a new facility and changing its name to Walnut Ridge Baptist Church, the congregation sold the downtown site to Faith Temple Baptist Church (American Baptist Churches USA). The building was individually listed on the National Register of Historic Places in 2000. In 2019 it was included as a contributing building in the Walnut Street Historic District.