[4] Construction on the current building began in 1902, with then-Vice President Roosevelt laying the cornerstone; he also gave an address at its 1903 dedication.

The decision of President Theodore Roosevelt to worship at the church added to the significance of the building's role in representing the denomination in the nation's capital.

All roofs were covered with Matthews Vermont slate and all cornice gutters were lined with McClure's IX Genuine Charcoal Iron redipped Tin.

At this time, the wainscoting was almost complete, one-third of the floor was laid, a three-manual organ had been purchased, and final preparations were beginning for the dedication ceremony scheduled or June 1903.

Pelz was also responsible for Georgetown University's Healy Hall, Riggs Memorial Library, and Medical Department; the Carnegie Library and Music Hall at Allegheny (now part of Pittsburgh), Pennsylvania; the Chamberlain Hotel at Fort Monroe, Virginia; the Government Hospital Buildings at Hot Springs, Arkansas; and the Hospital and Administration Buildings at the University of Virginia; and a great many private residences.

To the builders belongs great credit for having entered into the spirit which moved me with enthusiasm, and I am prone to say that I have sent my own inspiration down to the very hearts of all the workmen from the foreman down the chain to the very hod carriers and laborers, who are to day proud of having worked on your church..."[11][12] In his last official letter to Reverend Slagle, dated August 11, 1903, Pelz recognized the church's artistic value.

The quality of the sculptural work you permitted me to apply is of a high grade and should lead to emulation by other denominations for their memorial churches, if their building committees are intelligent enough to rise to the understanding required.

Although not as active in overseeing construction at the church as Pelz, Ritcher did receive half of the architects' fees, indicating that his role was more than minimal.

[12] A fourth or fifth generation stone carver, James F. Earley, was born in Birmingham, England in 1856 and studied sculpture at the Royal Academy in London.

[16][17] Between 1892 and his death in 1906, James F. Earley was responsible for much sculpture found on private residences, commercial and religious structures in Washington, D.C.

[12][13] Designed in the Late Gothic Revival style, Grace Reformed Church is rectangular in plan with vertical emphasis given by its soaring towers and spires.

The window is enclosed within a pointed arch label-molding with label-stops sculpted in the form of two heads representing a burgher and a knight.

Above the central window and within the gable is a pointed arch niche within which rests a figure supporting the shield of Frederick, the Elector of the Palatinate, and symbol of the Reformed Church.

A sculpted electorate cross terminates the top of the gable, while the spires of the corner towers project slightly higher.

Both consist of a central door with carved tympanums, and stained glass, rose windows above, all set within a pointed arch surround.

The doors on either side of the central entrance similarly open onto an extension of the wooden entry vestibule, leading church goers up the stairs to the balcony level, or onto the main floor.

A wide, contoured balcony, supported by cast iron columns, extends the entire width of the church across the west end.

The central nave of the church soars a full three stories high, terminating at the raised altar at the east end.

The east wall of the altar holds a Sacramental mosaic, beyond a high arch supported by clustered columns with foliated capitals.

The sides, vaulted at a lower level than the central aisle, are separated from it by a wooden entablature extending from the altar to the balcony.

Wooden ribs, at each bay, extend from the entablature and follow the vaulted ceiling of the aisles to rest on sculpted brackets of stone on the exterior end walls.

There are a total of eight stained glass windows in the church presenting a series of scenes from the life of Christ, beginning, along the south wall of the church, with the visit of the Magi at His birth, and culminating, at the large, five-paneled lancet window on center of the west wall, with the Ascension of Christ.

Six sculpted tympanums with the names of important Reformed Church leaders appear above the window openings of the Sunday School Building.

The names of "Zwingli" and "Calvin", the founders of the Reformed Church, are carved in the tympanums of the windows located on the third floor of the center bay with two fish sculpted next to them.

The names of "Bullinger" and "Beza", the successors of Zwingli and Calvin in Zurich and Geneva, appear at the second floor level in the side bays of the Sunday School facade.

At the basement level of the central bay are the names of the authors of the Reformed Church Catechism, "Ursinus", the theologian, and "Olevianus", the court preacher at Heidelberg.

Small rectangular openings are located at the gable above the Chi-Rho sculpture, a symbol associated with the Roman Emperor Constantine and his becoming a Christian in the fourth century.

Piers decorated with pointed arch niches, as found on the front facade of the church, buttress the edges of the central portion and ends of the wings of this east gable.

The elevation is not completely unornamented, however, as the casement windows of the first and second floors are recessed within pointed arches extending the full two stories.

[12] The Roosevelt Room, which is used for meetings and social events, is square in plan and incorporates into its east side wall the cornerstone of the original Grace Reformed Church Chapel on this same site.