healthcare_MontereyCommunity Hospital of the Monterrey Peninsula, Monterrey, California, expanded to include additional
hospital pavilions that provide much needed health programs and services (diagnostics, treatment, and critical care) for the extended neighborhood.

The project is located on a tight, semi-urban site in the middle of a protected forest. The critical scenic easements and local tree protection requirements significantly limited the area available for construction. The task of the Los Angeles office of Hellmuth, Obata & Kassabaum Architects was to retain the ambiance of the existing buildings designed by the acclaimed Edward Durrell Stone in the 1960s. The project scope included the addition of two three-story wings, each with about 100,000 square feet of floor space. The “Forest Pavilion” accommodates patient rooms. The “South Pavilion” houses the surgical and emergency facilities as well as the Intensive Care Unit. In addition, the existing building was remodeled to include diagnostic and treatment functions of the Radiology Department including X-ray, computed tomography-scan (CT), and magnetic resonance imaging scan (MRI).

The Los Angeles office of the structural engineering firm KPFF was charged with accommodating various architectural programming needs, including matching the floor heights of the existing Durrell Stone building. Furthermore, high seismic forces demanded that sufficient lateral strength be provided for this building.

A network of concrete shear walls 20- to 24-inches thick with extensive window openings was selected to serve as the seismic lateral force resisting system. The foundation system used a combination of mat footings that extended five-feet deep at the structural walls and isolated pad footings at lightly loaded gravity columns. A 10-inch thick conventionally reinforced concrete flat slab with four-inch drop panels was used to span 22 feet. At the perimeter of big floor openings 20-by-18-inch and 20-by-24-inch concrete beams were strategically added. Concrete strength was 4,000 psi for both floor system and walls.

The low floor to floor height,10 feet 6 inches, of the middle of the three levels necessitated a floor system with the least thickness possible in order to accommodate the extensive above ceiling infrastructure. The concrete flat slab floor system selected for the typical floors with conventional reinforcing made that project goal possible while maintaining alignment with the floors in the existing building. Vibration and deflection control provided by the concrete floor framing complemented the structural rigidity and seismic drift control achieved by the concrete walls.


Community Hospital of the Monterey Peninsula


Hellmuth, Obata & Kassabaum Architects (HOK), Los Angeles, California

Structural Engineer:
KPFF, Los Angeles, California

General Contractor:

John F. Otto Construction, Inc., Sacramento, California

Concrete Contractor:
McClone Construction Co., Shingle Springs, California