Mary Lou Castellanos

Mary Lou Castellanos
Real Estate Agent (Salesperson)
San Francisco CA

Salesperson (CA: 00905399)

41 years experience

REALTOR® 1 Active Listings Serves San Francisco County, CA
View on Realtor.com

Contact Information

Brokerage
Sotheby's International Realty

Office Website
Office Address
117 Greenwich St
San Francisco, CA  94111
(San Francisco County)
Office Phone
415-901-1700
Office Fax
415-901-1701
Mobile
415-901-1700
Email
marylou.castellanos@sothebys.realty

Service Areas

San Francisco: CA

About Mary Castellanos

Mary Lou stands out as one of the leading real estate professionals in the United States, bringing a wealth of knowledge about San Francisco's intricate history, diverse neighborhoods, and distinctive real estate landscape. With over two decades of experience, she has cultivated a robust career that encompasses a wide array of properties and clientele.

Recognized among the top 25 agents at Sotheby's International Realty, Mary Lou consistently ranks in the top 2% of nearly 50,000 sales associates affiliated with NRT, the firm’s parent company. Her achievements were further highlighted on June 22, 2012, when she was named one of the nation’s top real estate professionals in The Thousand, an esteemed ranking published by The Wall Street Journal and REAL Trends.

Mary Lou has earned the confidence of discerning buyers, sellers, and peers, known for her business acumen, strong work ethic, and approachable demeanor. She is dedicated to serving a diverse clientele, from first-time homebuyers to high-profile individuals, including celebrities and corporate executives. Her extensive portfolio features over 125 bank-owned properties sold since 2008, luxury condominiums, and co-ops, including the record-setting sale of a home for $29.5 million, the highest price in San Francisco MLS history.

Her academic background in International Business, coupled with her travels to more than 45 countries, has equipped her with a deep understanding of the needs of international clients and enhanced her ability to engage with corporate entities such as Bank of America, J.P. Morgan Chase, HSBC, and Capital One. This expertise has garnered attention from The Wall Street Journal and various local media outlets.

Beyond her professional achievements, Mary Lou is actively involved in humanitarian and cultural initiatives. She participated in significant airlifts, including those for Vietnamese and Angolan refugees, as well as the Hadj airlifts for West Africans traveling to Mecca. A culinary enthusiast, she has founded Pantry411.com, a platform designed to help food lovers discover local ingredients and culinary experiences. Additionally, she has served as past president of Pathways For Kids and is a board member of Enterprise for High School Students, where she co-chairs the Private Collections art tour.

San Francisco County, CA Real Estate Market Analysis (Single Family Homes)

$1,893,154
Avg. Listing Price
From Mary's portfolio
3.2 / 2.5
Avg. Beds/Baths
Typical property size
1,998 sf
Avg. Square Footage
Interior living space
300
Active Listings
Current inventory

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Current Property Listings

As of 6/27/2026, Mary Castellanos has 1 property for sale in San Francisco and surrounding areas.

$3,995,000

Listed 2026-06-08

3442 Clay St
San Francisco, CA  94118

Beds: 3.0
Baths: 2.5
Sq Ft: 2,380
Lot: 3,589 sf
Condo Map
View Full Details

Current Property Rentals

Mary Castellanos currently has no rental properties available in San Francisco and surrounding areas. Check back later.