The Greystone Cellars building stands on a terraced hillside site on the west side of 29/128, about a mile north of St. Helena's central business district.
It has 117,000 square feet (10,900 m²), three stories, and a basement, and is around 400 feet (120 m) long, 76 feet (23 m) wide, and 66 feet (20 m) tall, with 22-inch (56 cm) thick walls.
As a wine cellar, it held 3.5 million gallons.
The building was designed in the Richardson Romanesque style, with an arched entranceway and tower, stone mullions and transoms, a low sweeping roof, well-fitted stonework, and a large and simple stone façade.
The building's exterior is made of local light gray volcanic stone put together with Portland cement; the trimmings are of a red stone.
Bourne had insisted that gray stones were used in the east façade of the building (its main façade), with darker or other colored stones usable for the other sides of the building.
The roof originally used black slate roof tiles.

The building has a front projection measuring 50 by 20 feet (15 m × 6.1 m), which held the main entranceway and an office and sample room.
The former office has walls and ceilings of quartered oak, and includes a stone fireplace and vault door.
The former sample room has paneled mahogany walls and ceilings, a parquet floor, open bottle racks on walls, and two lockers of mahogany.
The windows are polished plate glass with stained glass transoms.
The tasting and sales rooms are still preserved in their original form.
The projection also includes a 20-by-20-foot (6.1 m × 6.1 m) stone tower that extends one story above the roof and was built to hold a large water tank.
A driveway wraps around the front and back of the building, where it is nearly level with the third floor.

The interior has two distinct wings with a large hallway between them, originally with an iron staircase and a hydraulic ram elevator both leading to the third floor.
Each side of the hallway on each floor had three doors 8 feet (2.4 m) wide.
4-inch (100 mm) iron pipes were placed through the walls and floors every thirty feet in order to pipe wine from one part of the building to another, and into and out of the building.

Property changes since the original construction include the front terrace, entranceway and landscaping.
The former front lawn and flower beds were paved over, and a new driveway was cut into the stone wall north of the original large stone arch over the first driveway.
The Greystone Cellars building stands on a terraced hillside site on the west side of 29/128, about a mile north of St. Helena's central business district. It has 117,000 square feet (10,900 m²), three stories, and a basement, and is around 400 feet (120 m) long, 76 feet (23 m) wide, and 66 feet (20 m) tall, with 22-inch (56 cm) thick walls. As a wine cellar, it held 3.5 million gallons. The building was designed in the Richardson Romanesque style, with an arched entranceway and tower, stone mullions and transoms, a low sweeping roof, well-fitted stonework, and a large and simple stone façade. The building's exterior is made of local light gray volcanic stone put together with Portland cement; the trimmings are of a red stone. Bourne had insisted that gray stones were used in the east façade of the building (its main façade), with darker or other colored stones usable for the other sides of the building. The roof originally used black slate roof tiles.
The building has a front projection measuring 50 by 20 feet (15 m × 6.1 m), which held the main entranceway and an office and sample room. The former office has walls and ceilings of quartered oak, and includes a stone fireplace and vault door. The former sample room has paneled mahogany walls and ceilings, a parquet floor, open bottle racks on walls, and two lockers of mahogany. The windows are polished plate glass with stained glass transoms. The tasting and sales rooms are still preserved in their original form. The projection also includes a 20-by-20-foot (6.1 m × 6.1 m) stone tower that extends one story above the roof and was built to hold a large water tank. A driveway wraps around the front and back of the building, where it is nearly level with the third floor.
The interior has two distinct wings with a large hallway between them, originally with an iron staircase and a hydraulic ram elevator both leading to the third floor. Each side of the hallway on each floor had three doors 8 feet (2.4 m) wide. 4-inch (100 mm) iron pipes were placed through the walls and floors every thirty feet in order to pipe wine from one part of the building to another, and into and out of the building.
Property changes since the original construction include the front terrace, entranceway and landscaping. The former front lawn and flower beds were paved over, and a new driveway was cut into the stone wall north of the original large stone arch over the first driveway.
The Culinary Institute of America at Greystone