Building 2, the original Sanitarium facility, was constructed in 1903. It faces North Washington Street, and has its main entrance in the center of the west façade. A wide circular drive extends off of Washington Street to the entrance canopy. A wide concrete stair takes pedestrians from the street up the gentle slope to the entrance. Several trees dot the lawn out front of this building, though the foliage is not nearly as dense as during the building's heyday. Buildings 2a, 2B, and 2C extend radially off the rear of Building 2, and originally houses the Men's Annex, Gymnasium, and Women's Annex, respectively. Originally surrounded by landscaped garden, additions to the complex, and the need for paved parking lots, decreased the grass area behind the main buildings. Courtyards between the radial additions, and between 2C and Buildings 1 and 1A are the only landscaped areas. Paths connect the buildings and lead to a small fountain between Buildings 2B and 2C. The area between Building 2 and 2A was a parking lot, but due to security measures is not barricaded off.
Building 2 is a six-story brick structure with a stone foundation. The walls are a yellowish-buff colored brick, with decorative piers, panels, and belt courses of grayish-buff colored brick. The darker brick also comprises the rusticated quoining at the corners of the building and is used for all facades on the lower floors. The building has stone sills and trim, with some wood and metal trim as well. There are decorative pediments above the main entrance at each end of the east and west facades and at the north and south ends of the building. Concrete stairs lead to the main (west) entrance, with a fieldstone and concrete portico. The rood and steel portico at the entrance contains some elements of the original portico. The entrance bay is surmounted by six large concrete columns, which extend from the order, and were originally painted. A set of four columns that march the entry colonnade are similarly located on the north façade. The south façade of the building was modified to accommodate a connection to Building 1 when that structure was completed in 1928. The enclosed porches on these facades were originally open.
The first floor of the west façade of Building 2 is an arcade, which was originally an open loggia. Today it has been enclosed by windows and infill panels. Each arch is banded by decorative brickwork with a central keystone. The archway directly to the south of the main entrance bay is slightly different in appearance; this archway originally held the entrance door to Dr. Kellogg's office rather than a porch opening. The canopy above the entrance has been replaced, and the retaining walls and concrete stair at the entrance have been replaced. The first floor at the south end of the building is one story above grade due to the slope of the site. A similar arcade pattern is continued around the other façade of building at the first floor. The east façade also contains a loading dock, and fire escapes are located at the northeast corner of the building.
The windows of Building 2 are double-hung, with the exception of the tall louvered windows of the upper floors at the center bay. A few of the original wood-trimmed windows remain at the south end of the east façade; all other windows have been replaced with metal frames and trim. Stucco and infill have been used above the first floor windows. On the three-wing building, some windows have been bricked up. Most of the exterior doors and windows have been replaced with new metal and door systems.
The sixth floor of Building 2 was significantly modified over the course of the building's history. The pediment at the south end of the west façade was raised, with new parapets added here and at the rear of the building. New stucco and aluminum-sided structures were added to the existing sixth floor structure. Building 2 has several roofing types; the main building roof is slightly sloped and covered by rubber membrane roofing, while the roof of the Palm Garden structure is flat with built-up roofing. The roofs of Buildings 2A and 2C are similar to that of the main building, while Building 2B is covered by a gable roof with asphalt shingles.
The interiors of Buildings 2, 2A, 2B, and 2C have been significantly modified since original construction. Historical photographs and architectural drawings document the appearance of the interior during the sanitarium's occupancy of the buildings, and when the property was part of the Percy L. Jones General Hospital. The interior today retains certain features of the original design, particularly in the public areas of Building 2.
The basement of Building 2 has concrete floors, which have been painted red, and brick walls, which have been painted white. In some areas the stone foundation wall has been stuccoed over and painted white. Partition walls are brick or block, and have also been painted. Both original wood and modern wood or metal doors have been painted white as well. Some original metal door hardware remains. Mechanical pipes follow the ceilings of all the major hallways, and portions of the original building structural system can be identified. The basement has suspended fluorescent ceiling fixtures and natural lighting where the site slopes and the basement is above grade. Offices on the south end of the west side of the basement have windows, which look out onto the west lawn of the building.
The basement of Building 2 is organized in a similar manner to the main floors of the building. A long corridor follows the north-south axis of the plan, and a semi-circular passageway, which bisects the semi-circle. Access to the basements of Buildings 2A, 2B, and 2C is through this semi-circular passageway. Mechanical tunnels lead from the basement to nearby buildings, which were originally part of the Sanitarium complex. Tunnels on the east side of the building become aboveground passageways toward the rear of the site, due to the slope of the ground. At the south end of the basement of Building 2 is a large room, which originally served as the Sanitarium Chapel. This space is presently under construction and any significant architectural elements have been removed or lost.
The first floor of Building 2 is organized along a double-loaded, north-south corridor. At the center of this floor is the entrance lobby, which is a one-story space at the west and a two-story space, overlooked by the mezzanine at the east side. The lobby has the original plaster ceiling ornament and decorative column capitals intact, although these surfaces have been painted. The east wall contains the entrance to the former Palm Court, which is surmounted by an overhang formerly used to hold plants. This wall also contains three leaded glass windows. The central glass panel bears the inscription, "He is thy Life." The lobby, which has new wall and floor surfaces, modern windows and a modern elevator, still holds the railing and marble stairs. The primary furniture in the space is the security desk and x-ray machine at the entrance. Though modern additions, the desk, and panels are a pleasant wood color, making it relatively unobtrusive. In the south corner of the room are display cabinets with articles from the Sanitarium years, including the bike that Dr. Kellogg rode to work each day.
The main corridor which follow the north-south axis of this floor has been modernized, and includes suspended acoustical tile ceilings, and carpeted floors. The walls are drywall and plaster with a spray-applied polychromatic paint finish, and inset fluorescent lighting fixtures provides lighting. This wall finish is common on each level of Building 1 and Building 2. Few if any original architectural features remain in this main corridor.
The Palm Garden at the east side of the center of this floor was converted by the Army into a lounge, and by the Federal Center into an Auditorium. Very few of the original features remain in the space. The clerestory windows and skylights of the original Palm Garden have been completely obscured or removed. Plaster and acoustical tiles now cover the walls and ceiling, and the floor has been carpeted. The room has a suspended acoustical ceiling with fluorescent fixtures and supplementary lighting, and has been completely equipped for use as an auditorium. The function of the room as a circulation center for the main building and its winds, and as a focus as a center, has been destroyed by the modifications.
The semi-circular passageway, which surrounds the Palm Garden, and leads to the radical wings off Building 2, incorporates a combination or original and modern features. The ceilings are drop acoustical tiles, and the floor has been carpeted. Some doorways have original wood frames, trim, sidelights, and fanlights. Other doorways, including the doors to the exterior between the three wings, are modern aluminum door and window frame systems. The new door systems retain the configuration of the original framing, although the character of the entry is different as a result of modifications.
The second floor lobby of building 2 overlooks the large first floor lobby. The mezzanine has original plasterwork, columns and decorative capitals, and railings. Modern additions to the space include new paint and carpeting. In these corridors some original doors and hardware remain. The corridor, which extends in either direction from the lobby, is typical of the main hallway on each floor of this building. IT is carpeted and has a suspended acoustical tile ceiling with inset fluorescent lights. Walls have been painted, along with any existing wood trim, and are not the original colors. Much of the wood trim has been replaced by vinyl molding.
An especially notable space remaining in Building 2 is the sixth floor lobby, formerly the "Dining Room in the Trees." Remarkably, every element above the cornice line of the original space has been retained, except the skylights. Though there is the absence of the skylights, the high coved ceiling does retain its decorative plaster frame. The moldings and column capitals are also original and serve along with the ceiling details as a reminder of the former elegance of the space. The columns that now appear as engaged pilasters in the east wall of the lobby were originally freestanding columns along the side of the dining room. The room has since been divided into several spaces, and along the west side are a series of offices, further compromising the light, open character of the space. These offices have the original decorative plasterwork of the earlier dining room, and also retain original molding, doors, and trim.
Throughout Building 2 there are other spaces that retain original features, though the modernization process have obscured the historic character of these spaces. Many of the office suites in the north end of the building still have the original layout and organization areas have become break areas and office areas, with the only indication of separate rooms being the difference sized windows. These end rooms, originally open porches behind the large colonnade, have original doors, transoms, trim, and hardware, though most are painted over. Modern additions to these rooms include new paint, suspended fluorescent ceiling fixtures, and wall-to-wall carpeting.