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Your Trusted Bay Area Real Estate Partner
Mark Lounsbury is a modern, independent, full-service real estate brokerage firm serving clients from Marin to San Francisco. With nearly 30 years of experience in luxury new construction developments and resale markets, we operate as consultants and project managers, prioritizing design expertise and emotional value in property marketing. Our team combines deep local market knowledge with a network of vetted professionals to deliver premium results for buyers and sellers. We specialize in recognizing hidden property value, managing risk, and positioning homes for optimal sales performance. Our proven track record in one of the nation's most competitive real estate markets demonstrates our ability to exceed client expectations through transparency, integrity, and personalized service.

We maintain boutique-level attention while leveraging extensive industry connections to facilitate seamless transactions. Our approach emphasizes education, empowering clients with comprehensive market insights throughout their real estate journey. This combination of experience, local expertise, and client-centric philosophy has established us as trusted advisors in the Bay Area real estate market.
Services
Buyer Representation Seller Representation Property Valuation Neighborhood Guides Transaction Management Market Analysis Home Staging Investment Properties Luxury Real Estate New Construction Sales
Highlights and features
  • We offer 30 years of combined experience in Bay Area real estate markets
  • Our team includes CA DRE licensed professionals with local market expertise
  • We implement design-driven marketing strategies for premium property positioning
  • Our transaction process emphasizes transparency and risk management
  • We maintain a 100% client satisfaction rate across all completed transactions
What people say
Best realtor I've ever had Stress-free transactions Perfect mix of determination and charm Knowledgeable about local market Dedicated and detail-oriented
Services
Buyer Representation
Our buyer representation service combines deep market knowledge with personalized guidance to help clients find ideal properties. We provide comprehensive support throughout the purchasing process, from initial property searches to final closing. Our expertise in Bay Area markets ensures clients receive strategic advice on offer negotiations and market positioning.
Seller Representation
We offer full-service property sales solutions that maximize value through strategic marketing and design expertise. Our team prepares homes for market, manages disclosure processes, and implements targeted marketing campaigns to attract qualified buyers. Our proven track record demonstrates consistent premium pricing achievement.
Property Valuation
Our valuation services utilize current market data and comparative analysis to determine accurate pricing strategies. We combine local market expertise with historical transaction data to provide precise property assessments that reflect current market conditions and potential.
Neighborhood Guides
We provide detailed neighborhood information covering schools, amenities, and market trends across San Francisco and Marin County. Our guides help clients make informed decisions about property investments based on comprehensive local knowledge.
Transaction Management
Our transaction management ensures smooth closings through coordinated professional networks and risk management expertise. We oversee all aspects of the closing process, maintaining clear communication between all parties to guarantee timely and successful completions.
People
Cheryl Spence
Principal, Broker
With over 25 years of Bay Area real estate experience, Cheryl specializes in luxury property transactions and market strategy. Her expertise in design-driven marketing and client advocacy has earned consistent top-tier results for clients across San Francisco and Marin markets.
Kelsey Gross
Sales Consultant
Kelsey brings extensive market knowledge and client service expertise to the Jupiter Real Estate team, focusing on connecting clients with ideal property solutions. Her approach emphasizes clear communication and thorough market education for all clients.
Questions
How does Jupiter Real Estate Group handle competitive Bay Area markets?
Our team leverages 30 years of local market expertise and strategic design-driven marketing to position properties for success in competitive environments.
What makes your real estate services unique?
We combine real estate consulting with project management expertise, focusing on emotional value creation and premium property positioning.
Which areas do you specialize in?
We specialize in San Francisco and Marin County markets, including Mill Valley, Sausalito, Tiburon, and surrounding communities.
How do you support first-time home buyers?
We provide comprehensive guidance, transparent evaluations, and personalized support throughout the entire home buying process.
What transaction services do you offer?
We manage complete real estate transactions including property valuation, marketing, offer negotiation, and closing coordination.