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3526 7th Avenue


3526 7th Avenue

3526 7th Avenue, San Diego, California 92103


Nestled in Balboa Park’s northwest corner, the 3500 block of Seventh Avenue is one of San Diego’s best-kept secrets. Originally built in 1906 by Irving Gill himself, this original Architectural Masterpiece is situated on one of the most highly coveted streets in San Diego. This section of 7th Ave adjacent to Balboa Park is home to only 8 historic homes including the famous Marston House Museum. This amazing estate features the perfectly manicured grounds with Avocado trees, peaceful gardens, 2 Koi ponds. This is San Diego outdoor living at it's finest, perfect for entertaining with large gatherings. The main house has historic designation with Mills Act in place. It features 3 bedrooms with ensuite baths and a powder room. The condition of the home is impeccable with original milled wood work, 4 fireplaces with original tile, music room, butler's pantry, large dining room, upgraded eat-in kitchen and remodeled bathrooms. Situated on this expansive 14000 square foot lot is a very spacious & rare 3 car garage with a 1 bedroom guest house above adjacent to a large storage area. This was the fourth design by Irving Gill for the San Diego civic activist and residential developer, Mary Cossitt. This house was located across the street from the George Marston House. Designers: Hebbard and Gill, Architects (firm); Irving John Gill (architect); William Sterling Hebbard Sr. (architect) Dates: constructed 1905-1906

Additional History of the home can be found below: William Hebbard & Irving Gill, architects San Diego Historical Site #97 Frederick Cossitt served as rector of Christ Episcopal Church in Coronado. In 1896, Gill designed a house for the Cossitts in Coronado (this has since been moved and divided into two separate homes). Later, Hebbard and Gill designed two additional houses in Coronado for them as rentals. Mary Cossitt purchased the Seventh Avenue property from George Marston in July of 1906, and immediately hired Hebbard and Gill to design yet another house, this one to be their permanent residence. Rev. Cossitt died in 1911, and Mary and daughter Helen were last listed at this address in 1913. Mary sold the property to Dr. Bernard & Anna O’Neill in 1918. Strongly influenced by the Prairie Style, this is one of the first buildings to show the modern trends that Gill’s later work would take. He designed it as a series of receeding and enlarging cubic shapes with broad flat eaves. The interior features a large Inglenook and extensive use of redwood paneling. In 1910, Mary Cossitt commissioned Gill to design four more rental houses. These are still standing on Eighth Avenue south of Robinson, and are in Gill’s severe stripped-down style based on the cube relieved by arches.   The entrance hall of the Cossitt house featured glass doors leading into the living room, and extensive use of redwood board and batten paneling.   In this view of the south side of the Cossitt house, Gill’s stepped treatment becomes apparent. Beginning with the englenook, the house enlarges into a living room with high ceiling and clerestory windows, and finally into a two story structure.


4 Beds

4.5 Baths

4,934 Sq.Ft. Living Area

0.32 Acres Lot

Todd  Armstrong photo

Todd Armstrong

Features & Amenities


Total Bedrooms 4
Total Bathrooms 4.5
Full Bathrooms 4
Half Bathrooms 1
Kitchen Kitchen Island, Breakfast Area, Dining Area
Laundry Room Washer / Dryer in Unit, In Garage, Electric, Gas
Flooring Tile, Wood
Fireplace 4, FP in Dining Room, FP in Family Room, FP in Living Room, FP in Master BR
Appliances Dishwasher, Disposal, Dryer, Microwave, Refrigerator, Washer, Electric Oven, Electric Range, Electric Cooking
Other Interior Features Built-Ins, Ceiling Fan, Crown Moldings


Stories 2
Garage Space 3
Water Source Meter on Property
Utilities Cable (coaxial), Multiple Phones, Electricity, Natural Gas, Sewer, Water
ROOF Asphalt
Lot Features Alley Access, Corner Lot, Public Street, Sidewalks, Street Paved
Parking Parking Included, Detached Garage, Rear Entry, Street Parking, Garage Door Opener
Heat Type Forced Air Unit, Natural Gas
Water Features Water Heater Type: Gas, Automatic Irrigation, Sprinklers
Sewer Sewer Connected
Substructure Stucco, Wood
Security Features Smoke Detector, Carbon Monoxide Detectors
Other Exterior Features Private Outdoor Space, Full Fencing, Balcony, Patio, Detached Guest House

Area & Lot

Status For Sale
LOT SIZE 0.32 Acres
MLS ID 220005363
Year Built 1906
View Description Parklike


SALES PRICE $5,200,000

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