Selling a $7.175 Million Luxury Home in Danville, CA: The 333 Quinterra Lane Case Study

Case Study at a Glance: The $7.175 Million Sale of 333 Quinterra Lane

The completed transaction deserves attention because it involved an unusually substantial residential parcel near downtown Danville, a historic estate identity, multiple auxiliary structures, and a multimillion-dollar purchase price.

The sale is included among Taso Tsakos' sold luxury properties , providing documented evidence of his experience with higher-value East Bay residential transactions.

The Property: Inside 333 Quinterra Lane in Danville, California

Location and Historic Residential Setting

Situated near downtown Danville, 333 Quinterra Lane is known as the Hartz Estate.

The property's original listing describes it as a residence historically associated with John Hartz, identified in the property's marketing narrative as one of Danville's pioneering founders.

Its Colonial architectural character and established grounds contribute to the estate's distinctive identity.

The property occupies a relatively level 1.58-acre parcel with a gated circular driveway, mature landscaping, and a private residential setting.

Compared with more conventional residential lots, the acreage creates additional possibilities for outdoor enjoyment, property improvements, and future planning, subject to applicable regulations.

Colonial Architecture and Traditional Craftsmanship

Built in 1959, the Hartz Estate reflects traditional Colonial architectural influences.

Its interior features formal living and dining rooms, a family room, detailed millwork, hardwood flooring, and multiple fireplaces.

The original property description emphasizes traditional craftsmanship and generously proportioned interior spaces.

These design elements distinguish the residence from newer luxury homes built around contemporary open-plan layouts.

The estate's established architectural identity is an important consideration for buyers evaluating historic character alongside opportunities for modernization.

Seven Bedrooms and 5,593 Square Feet of Living Space

The property contains approximately 5,593 square feet of recorded living space, with seven bedrooms and seven bathrooms.

The listing describes five upstairs bedrooms in the main residence, including a room being used as a home office when the property was marketed.

Two separate staircases provide access to the upper level.

The home's floor plan includes formal gathering spaces and additional rooms that accommodate different residential uses.

Its substantial size also makes room configuration, circulation, and the relationship between living spaces important elements of the property's overall evaluation.

Kitchen and Interior Features

The kitchen is positioned toward the rear of the residence and overlooks the surrounding grounds.

The original property description identifies potential for kitchen modernization or a larger great-room configuration.

That potential was part of the property's marketed appeal, rather than a representation that renovations had already been completed.

Other documented interior features include a breakfast nook, formal dining room, family room, hardwood and carpet flooring, and fireplaces in several living areas.

Guest Accommodations and Auxiliary Structures

One of the Hartz Estate's distinguishing features is its collection of auxiliary structures.

The property includes a one-bedroom accessory dwelling unit above the garage and a substantial pool house with a second kitchen.

The listing also describes a wine cellar capable of accommodating more than 5,000 bottles.

These features give the property a different functional profile from a conventional seven-bedroom residence.

They expand the property's potential uses for guest accommodation, entertaining, hobbies, and storage.

Outdoor Amenities and Estate Grounds

The Hartz Estate includes landscaped gardens, mature trees, an in-ground swimming pool, and a pool house.

Its outdoor setting is further defined by a gated entrance, circular driveway, level land, and established landscaping.

The original listing discusses possible subdivision or redevelopment concepts. Any such potential would require independent evaluation of zoning, permits, planning restrictions, utility requirements, and local approval processes.

These documented characteristics formed an important part of the estate's identity when it entered the luxury real estate market.

Additional property specifications are available through the 333 Quinterra Lane property listing .

The Seller's Objective: Positioning a High-Value Danville Estate

Understanding the Seller's Goals

The documented transaction establishes that the owners offered 333 Quinterra Lane for sale in May 2025 with an asking price of $7.5 million.

The available public information does not identify the seller's private priorities regarding preferred timing, minimum acceptable pricing, privacy, or individual transaction requirements.

Accordingly, this case study does not attribute unverified motivations to the seller.

Evaluating the Estate's Market Position

Several characteristics distinguished the property within Danville's luxury residential inventory.

These included its Colonial architecture, 1.58-acre parcel, location near downtown, substantial interior living area, detached guest accommodation, pool house, and large-capacity wine cellar.

The combination offered a different proposition from both newly constructed luxury homes and conventional established residences.

A property with this range of characteristics generally requires an individual assessment of location, condition, land, architecture, improvements, and comparable sales.

Market Considerations for a $7.175 Million Danville Property

A Specialized Luxury Buyer Market

Homes priced above $7 million generally appeal to a more specialized group of prospective purchasers than properties at lower price points.

At this level, buyers may evaluate architectural character, property condition, land configuration, renovation possibilities, and the availability of alternative high-end homes.

For the Hartz Estate, the combination of an established residence and extensive supporting amenities created several factors for consideration.

These are general market considerations and should not be interpreted as evidence that a particular buyer concern delayed or complicated the transaction.

Comparing a Distinctive Estate With Other Luxury Homes

Traditional comparable-sales analysis can be more difficult when a property includes unusual features or substantially more land than neighboring homes.

The Hartz Estate's historic identity, auxiliary buildings, and 1.58-acre parcel distinguish it from properties that may have similar interior square footage but different layouts or lot characteristics.

A comprehensive valuation must recognize these differences without assuming that every distinctive feature contributes equally to market value.

Communicating the Property's Existing Features and Potential

The property's listing presented both its existing architectural characteristics and opportunities for future improvements.

This distinction matters because prospective purchasers must be able to separate the value of completed improvements from the costs and approvals associated with possible renovations.

No specific inspection dispute, financing problem, buyer objection, or negotiation obstacle has been publicly established for this sale.

Taso Tsakos' Role in the 333 Quinterra Lane Transaction

Verified Seller Representation

Taso Tsakos was the listing agent representing the seller in the 333 Quinterra Lane transaction.

The MLS transaction record identifies Engel & Völkers Danville as the listing brokerage for the 2025 sale.

Gregory Jackson of The Agency represented the buyer.

These roles establish Taso's direct professional involvement on the seller's side of the completed transaction.

The records do not provide a detailed allocation of every marketing, showing, or negotiation responsibility carried out during the sale.

Professional Experience in Danville Luxury Real Estate

Taso Tsakos has extensive experience with residential real estate throughout Danville and the surrounding East Bay.

His portfolio includes multimillion-dollar transactions in Danville, Alamo, Diablo, Blackhawk, and nearby communities.

His background in real estate and development provides relevant experience for working with properties that have distinctive architectural characteristics and improvement considerations.

For prospective luxury sellers, verified transaction experience provides useful context when evaluating professional representation.

Homeowners can review Taso Tsakos' luxury real estate experience for more information about his professional background.

Collaboration Across the Transaction

The completed sale involved representation on both sides of the transaction.

Taso Tsakos represented the seller, while Gregory Jackson represented the buyer.

The documented outcome is a completed transfer at $7,175,000.

It would be inaccurate to attribute every aspect of the transaction exclusively to one participant without additional evidence.

The Strategy: How 333 Quinterra Lane Was Positioned and Sold

Documented Pricing Strategy and Listing History

The clearest documented element of the sales process is the property's listing price and transaction timeline.

The Hartz Estate was offered at $7,500,000 when it entered the market on May 19, 2025.

Public listing records do not show an intervening asking-price reduction before the property went under contract.

The final sale closed at $7,175,000 on June 23, 2025.

The records establish the price and timing, but do not disclose the internal market analysis used to select the original asking price.

Presenting the Hartz Estate's Distinctive Characteristics

The property's public listing highlighted its historic identity, Colonial architecture, expansive grounds, established landscaping, guest accommodations, pool house, and wine cellar.

It also described the potential to modernize portions of the interior or evaluate alternative development concepts, subject to appropriate approvals.

These were documented elements of the property's marketing description.

However, the public transaction record does not establish who prepared each marketing asset or which individual promotional activities produced buyer interest.

Market Exposure and Buyer Engagement

The property was publicly marketed through its MLS listing and associated online residential real estate platforms.

The listing was published on May 19, 2025, and the transaction subsequently progressed to pending status.

Available records do not confirm the number of private showings, offers received, advertising expenditures, or individual outreach methods.

As a result, this case study does not attribute the sale to an unverified advertising campaign, buyer network, or exclusive marketing event.

Offer Evaluation and Negotiation

The accepted transaction ultimately produced a sale price of $7,175,000, compared with the $7,500,000 asking price.

This represented a difference of $325,000.

The property sold for approximately 95.7% of its listed asking price.

No publicly verified information establishes competing offers, buyer concessions, counteroffer sequences, or specific negotiation methods.

Therefore, the completed result is presented without speculating about confidential transaction discussions.

From Listing to Closing

The property entered the market on May 19, 2025.

One MLS-based history reports a pending status on May 23, 2025, while another records a pending-sale update on June 3, 2025.

Both sources establish that the property progressed toward closing after the initial May listing.

The completed sale was recorded in MLS transaction history on June 23, 2025.

The span from initial listing to recorded sale was approximately 35 days.

That period should not be confused with a verified active days-on-market metric, which can depend on the listing system's status calculations.

The Result: A $7.175 Million Luxury Home Sale in Danville, CA

Final Sale Price

$7,175,000 — Final Recorded Sale Price

The Hartz Estate transaction closed on June 23, 2025, documenting the sale of a substantial Colonial-style property near downtown Danville.

The sale provides a measurable example of a multimillion-dollar residential transaction within Contra Costa County's luxury market.

Verified Transaction Results

What the Transaction Demonstrates

The 333 Quinterra Lane sale illustrates how a distinctive established estate can be evaluated and transacted within Danville's higher-priced residential market.

Its value proposition included architecture, substantial land, residential accommodations, and specialized auxiliary structures.

The completed transaction also demonstrates that an asking price and final purchase price are not necessarily identical.

Taso Tsakos' verified role as listing agent connects his professional transaction history directly to this $7.175 million sale.

No market-record ranking or specific marketing causation is claimed without supporting evidence.

Why Danville, CA Is an Important Luxury Real Estate Market

Danville's Residential Character

Danville is located in Contra Costa County's San Ramon Valley, surrounded by the East Bay's established residential communities and hillside landscapes.

The town includes a mixture of established neighborhoods, custom residences, larger residential parcels, and newer luxury construction.

Its historic downtown, regional road connections, and varied residential settings contribute to differences among individual housing markets.

Luxury Estates and Larger Residential Properties

Danville's luxury housing market includes properties with substantial interior space, large lots, specialized architecture, and extensive outdoor amenities.

The Hartz Estate represents a particular segment of that market because of its Colonial design, historic identity, and 1.58-acre setting.

Other luxury properties may feature different combinations of new construction, hillside views, recreational facilities, or contemporary architecture.

Proximity to Blackhawk, Alamo, and San Ramon

Danville's location places it near Blackhawk, Alamo, Diablo, and San Ramon.

These communities contain distinct residential areas with different property types, lot configurations, and market characteristics.

Understanding these differences is relevant when identifying appropriate comparable sales for a high-value residence.

The Importance of Hyperlocal Market Knowledge

Two luxury homes with similar interior square footage may differ substantially in value because of location, land usability, architectural design, condition, and supporting structures.

This makes property-specific market analysis especially important when evaluating established estates such as 333 Quinterra Lane.

Explore luxury real estate in Danville, California for additional information about the town's residential neighborhoods and housing characteristics.

Five Key Lessons From the 333 Quinterra Lane Case Study

1. Luxury Homes Require Individual Pricing Analysis

The Hartz Estate combined a large residential lot, Colonial architecture, supporting buildings, and a substantial interior floor plan.

Properties with uncommon characteristics should be evaluated using carefully selected comparable transactions and a thorough understanding of their condition and market position.

2. Property Presentation Should Reflect Distinctive Features

The estate's public marketing materials emphasized its history, architecture, landscaped setting, and additional residential facilities.

For luxury sellers, accurately describing significant features helps potential purchasers understand what differentiates one property from another.

3. Existing Improvements and Future Potential Must Be Distinguished

The 333 Quinterra Lane listing discussed both established improvements and opportunities for modernization.

These are different elements of a property's market positioning.

Future improvements or redevelopment concepts should be assessed independently and never presented as guaranteed opportunities without appropriate approvals.

4. Transaction Metrics Provide More Reliable Evidence Than Promotional Claims

The property's $7.5 million asking price, $7.175 million sale price, and recorded closing date provide concrete evidence of the completed transaction.

Such figures offer a clearer basis for evaluating results than unsupported claims about negotiation success, buyer demand, or marketing effectiveness.

5. Relevant Local Transaction Experience Matters

Taso Tsakos' documented seller representation in the transaction provides an example of experience with a high-value Danville property.

Prospective sellers should evaluate an agent's previous transactions, specific responsibilities, local knowledge, and ability to explain a property's position within the current market.

What This Sale Means for Danville Luxury Homeowners

Understanding Your Property's Market Position

The Hartz Estate's sale offers useful perspective for owners of substantial residences in Danville, Blackhawk, Alamo, and surrounding East Bay communities.

It demonstrates the importance of evaluating a property's actual characteristics rather than relying solely on its asking price, interior size, or perceived prestige.

Reviewing Comparable Luxury Sales

Luxury homeowners should consider recent closed transactions involving similar properties, while accounting for differences in condition, acreage, architecture, amenities, and location.

A completed transaction such as 333 Quinterra Lane can provide useful context, but it should not automatically be treated as a direct comparable for every Danville luxury home.

Evaluating Property Preparation and Presentation

Preparing a luxury residence for sale may involve reviewing condition, documenting improvements, assessing design features, and identifying potential areas requiring attention.

The most appropriate approach depends on the property and the seller's objectives.

Choosing Experienced Seller Representation

When evaluating a luxury real estate agent, homeowners can review completed sales, representation roles, local transaction experience, and proposed pricing and marketing approaches.

The Taso Tsakos Real Estate website provides additional information about his professional services and luxury property portfolio.

Every luxury property differs in condition, location, design, timing, and market demand.

The $7.175 million result achieved at 333 Quinterra Lane does not guarantee a comparable sale price or transaction timeline for another property.

Frequently Asked Questions About Luxury Home Sales in Danville

How Much Did 333 Quinterra Lane in Danville Sell For?

The luxury home at 333 Quinterra Lane in Danville, California, sold for $7,175,000 on June 23, 2025. The property was originally listed for $7.5 million on May 19, 2025. Taso Tsakos represented the seller, while Gregory Jackson of The Agency represented the buyer.

Where Is 333 Quinterra Lane Located?

The property is located at 333 Quinterra Lane, Danville, CA 94526, in Contra Costa County. Known as the Hartz Estate, it occupies approximately 1.58 acres near downtown Danville. The property features a Colonial-style residence, established landscaping, a gated circular driveway, and several auxiliary structures.

How Large Is the Property at 333 Quinterra Lane?

The Hartz Estate offers approximately 5,593 square feet of recorded living space on a 1.58-acre parcel. It includes seven bedrooms, five full bathrooms, and two half bathrooms. Additional features include an accessory dwelling unit, pool house, swimming pool, and wine cellar.

What Factors Influence Luxury Home Prices in Danville, CA?

Luxury home values in Danville can be influenced by location, lot size, architectural quality, interior square footage, property condition, amenities, and recent comparable sales. Distinctive properties may require more specialized analysis because homes with similar size or pricing can differ significantly in their land, design, and improvements.

How Are Multimillion-Dollar Homes Marketed in Danville?

Depending on the property and representation agreement, multimillion-dollar homes may be marketed through MLS exposure, detailed property descriptions, professional presentation, real estate websites, and broker outreach. The specific methods used for 333 Quinterra Lane beyond its documented public listing have not been independently established.

How Can I Find an Experienced Luxury Real Estate Agent in Danville?

Review an agent's completed luxury transactions, representation history, knowledge of Danville neighborhoods, pricing methodology, and marketing approach. Ask how comparable sales will be selected and how the property's distinctive features will be evaluated. Taso Tsakos' documented transactions include the $7.175 million sale of 333 Quinterra Lane.

Conclusion: A Significant Luxury Real Estate Transaction in Danville

The $7.175 million sale of 333 Quinterra Lane represents a documented luxury real estate transaction involving one of Danville's distinctive established residential estates.

The Hartz Estate combined Colonial architecture, approximately 5,593 square feet of living space, a 1.58-acre parcel, guest accommodations, a pool house, and specialized amenities.

Its recorded transaction history shows a $7.5 million asking price in May 2025 and a completed sale of $7.175 million on June 23, 2025.

Taso Tsakos' verified role as the seller's listing agent connects his professional experience directly to this completed multimillion-dollar transaction.

For other Danville luxury homeowners, the case study illustrates the importance of understanding individual property characteristics, evaluating comparable sales, and selecting representation with relevant market experience.

Most importantly, the transaction demonstrates that actual sale outcomes should be assessed through documented facts rather than unsupported assumptions about marketing or negotiation methods.

Considering Selling a Luxury Home in Danville or the East Bay?

Considering selling a luxury home in Danville, Blackhawk, Alamo, Diablo, San Ramon, or the surrounding East Bay?

Connect with Taso Tsakos Real Estate to discuss your property's market positioning, relevant comparable sales, current conditions, and a personalized approach to your real estate goals.

Taso Tsakos | Broker Associate, Global Real Estate Advisor

CA DRE #01157444

Phone: (925) 785-5419

Website: tasotsakosrealestate.com

Every real estate transaction is unique. Past transaction results do not guarantee future sale prices, marketing timelines, or outcomes. Property characteristics and market conditions may change.