In 1887, while still in partnership with Smithmeyer, he proposed an exuberant neo-medieval design for a new memorial bridge across the Potomac in honor of Ulysses S. Grant, a predecessor plan to the Arlington Memorial Bridge which was eventually built in the 1930s. In 1898, at the request of socialite Mary Foote Henderson, he proposed designs for a new Executive Mansion to replace the White House on what is now Meridian Hill Park. Pelz was a prominent participant in the 1900 Convention of the American Institute of Architects and presented a plan there for the remodeling of the National Mall which was a key source of the McMillan Plan the following year. Pelz's first wife, Louise Dorothea Kipp, died in 1894. In 1895, he remarried with Mary Eastbourne (Ritter) Meem (1849–1914). On 30 March 1918, he died in Washington, D.C. He is buried together with his second wife in Oak Hill Cemetery in Washington, D.C. Style Like other architects of his time, Pelz mastered a range of architectural styles and was willing to switch across them depending on program and client's taste. His designs included Romanesque Revival (Carnegie Library of Allegheny, McGill Building, Memorial Bridge project), Gothic Revival (Antietam Cemetery gatehouse, Hot Springs Hospital, Grace Reformed Church), a hodgepodge of Neo-Medieval styles at Georgetown University's Healy Hall, French Renaissance (Miller House), Neo-Georgian (Elkins Mansion), American Federal (University of Virginia), Stick Style (several lighthouses, US Soldiers' Home Library), and Beaux-Arts (Library of Congress, Foraker Mansion, Meridian Hill Executive Mansion project). For the Library of Congress project alone, Pelz provided alternative designs in styles that included Romanesque, 13th-Century Gothic, Victorian Gothic, Italian Renaissance, French Renaissance, German Renaissance, and French Classical. Works Lighthouses St. Augustine Lighthouse, St. Augustine, Florida, 1871 Bodie Island Light near Nags Head, North Carolina, 1872 Sand Island Light, mouth of Mobile Bay, Alabama, 1873 Mare Island Light, San Pablo Bay, California, 1873 (demolished in the 1930s) Point Fermin Light, San Pedro, California, 1874 East Brother Island Light, Richmond, California, 1874 Hereford Inlet Light, North Wildwood, New Jersey, 1874 Point Hueneme Light, Santa Barbara Channel, California, 1874 (replaced in 1940) Currituck Beach Light, Corolla, North Carolina, 1875 Point Adams Light, Columbia River mouth, Washington State, 1875 (demolished in 1912) Morris Island Light near Charleston, South Carolina, 1876 Life Saving Stations Deal, New Jersey, 1883 Atlantic City, New Jersey, 1884 Brenton Point, Newport, Rhode Island, 1884 (destroyed by the 1938 New