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4521 State Highway 121
Plano, TX 75024 Plano

$1,837,500 - $2,112,000 USD

Office Condos For Sale  •  3,500+ SF

Property Details

  • Property Type Office
  • Total Building Size 44,720 SF
  • Lot Size 0.27 AC
  • Building Class A
  • Year Built 2028
  • Tenancy Single
  • Zoning COMM
0 Transit Score
60 Walk Score

12 Units Available

Name Condo Use Size Price Details
1st Floor - Unit BLDG 01 Office 3,840 SF $2,016,000 USD
  • Unit Size: 3,840 SF
  • Condo Use: Office
  • Price: $2,016,000 USD
  • Sale Type: Owner User
  • Price/SF: $525.00 USD
Description
Building 01 is one of the largest ownership opportunities within Interurban, offering 3,840 square feet across two floors. The expansive footprint accommodates large conference areas, multiple executive offices, substantial open workspace, a grand reception area with ceilings reaching up to 24 feet, a full kitchen, multiple bathrooms, and a signature floating staircase.

Owners can further personalize the space with features such as podcast studios, private lounges, cigar rooms, additional meeting spaces, or other purpose-built environments.

Building 01 is also one of the few opportunities within Interurban to offer both a front balcony and rear patio, along with 12 dedicated parking spaces.

Following execution of the Purchase and Sale Agreement, owners may proceed with the standard Building 01 plan as designed or enter a collaborative architectural and engineering process to customize the property further. Unlike typical interior customization, Building 01 provides the opportunity to explore modifications to the building envelope itself, allowing the architecture to evolve alongside the owner's specific vision and use case.

3,840 SF | Two Floors | 12 Dedicated Parking Spaces | Front Balcony + Rear Patio

Available September 30, 2027.

Sale Notes
Building 01 is one of the largest ownership opportunities within Interurban, offering 3,840 square feet across two floors. The expansive footprint accommodates large conference areas, multiple executive offices, substantial open workspace, a grand reception area with ceilings reaching up to 24 feet, a full kitchen, multiple bathrooms, and a signature floating staircase.

Owners can further personalize the space with features such as podcast studios, private lounges, cigar rooms, additional meeting spaces, or other purpose-built environments.

Building 01 is also one of the few opportunities within Interurban to offer both a front balcony and rear patio, along with 12 dedicated parking spaces.

Following execution of the Purchase and Sale Agreement, owners may proceed with the standard Building 01 plan as designed or enter a collaborative architectural and engineering process to customize the property further. Unlike typical interior customization, Building 01 provides the opportunity to explore modifications to the building envelope itself, allowing the architecture to evolve alongside the owner's specific vision and use case.

3,840 SF | Two Floors | 12 Dedicated Parking Spaces | Front Balcony + Rear Patio

Available September 30, 2027.

1st Floor - Unit BLDG 03 Office 3,840 SF $2,112,000 USD
  • Unit Size: 3,840 SF
  • Condo Use: Office
  • Price: $2,112,000 USD
  • Sale Type: Owner User
  • Price/SF: $550.00 USD
Description
BLDG 03 is now under contract! Inquire for other availability/back up reservations.

Sale Notes
BLDG 03 is now under contract! Inquire for other availability/back up reservations.

1st Floor - Unit BLDG 04 Office 3,840 SF $2,112,000 USD
  • Unit Size: 3,840 SF
  • Condo Use: Office
  • Price: $2,112,000 USD
  • Sale Type: Owner User
  • Price/SF: $550.00 USD
Description
BLDG 04 is now under contract! Inquire for other availability/back up reservations.

Sale Notes
BLDG 04 is now under contract! Inquire for other availability/back up reservations.

1st Floor - Unit BLDG 05 Office 3,840 SF $2,112,000 USD
  • Unit Size: 3,840 SF
  • Condo Use: Office
  • Price: $2,112,000 USD
  • Sale Type: Owner User
  • Price/SF: $550.00 USD
Description
BLDG 05 is now under contract! Inquire for other availability/back up reservations.

Sale Notes
BLDG 05 is now under contract! Inquire for other availability/back up reservations.

1st Floor - Unit BLDG 06 Office 3,840 SF $2,112,000 USD
  • Unit Size: 3,840 SF
  • Condo Use: Office
  • Price: $2,112,000 USD
  • Sale Type: Owner User
  • Price/SF: $550.00 USD
Description
BLDG 06 is now under contract! Inquire for other availability/back up reservations.

Sale Notes
Interurban | Foundry Plano is a walkable boutique office campus on 3.5 acres within Mustang Square, a 36-acre mixed-use district at State Highway 121 and Rasor Boulevard in the Plano–Frisco corridor. Minutes from Legacy West, The Star, Grandscape, Stonebriar Centre, Toyota, Samsung and AT&T.

Rather than a conventional office park defined by repetition, Interurban is designed to feel like a district that evolved over time — buildings sharing one architectural language while varying in form, materiality and detail. The café anchors the campus socially, giving the businesses on site a place to gather and the surrounding community a reason to come in.

1st Floor - Unit BLDG 07 Office 3,840 SF $2,112,000 USD
  • Unit Size: 3,840 SF
  • Condo Use: Office
  • Price: $2,112,000 USD
  • Sale Type: Owner User
  • Price/SF: $550.00 USD
Description
Building 07 IS NOW UNDER CONTRACT

Sale Notes
Building 07 IS NOW UNDER CONTRACT

1st Floor - Unit BLDG 08 Office 3,840 SF $2,016,000 USD
  • Unit Size: 3,840 SF
  • Condo Use: Office
  • Price: $2,016,000 USD
  • Sale Type: Owner User
  • Price/SF: $525.00 USD
Description
BLDG 08 is now under contract! Inquire for other availability/back up reservations.

Sale Notes
Interurban | Foundry Plano is a walkable boutique office campus on 3.5 acres within Mustang Square, at State Highway 121 and Rasor Boulevard in the Plano–Frisco corridor. The campus centers on the future Foundry Café, with hospitality-inspired gathering spaces, planned health and wellness amenities, and curated retail and dining.

Rather than a conventional office park defined by repetition, Interurban is designed to feel like a district that evolved over time — buildings sharing one architectural language while varying in form, materiality and detail. Every owner gets a private building, a front door, and an address that belongs to their business.

Minutes from Legacy West, The Star, Grandscape, Stonebriar Centre, Toyota, Samsung and AT&T.

1st Floor - Unit BLDG 09 Office 3,500 SF $1,837,500 USD
  • Unit Size: 3,500 SF
  • Condo Use: Office
  • Price: $1,837,500 USD
  • Sale Type: Owner User
  • Price/SF: $525.00 USD
Description
Building 09 is one of only two 3,500 square foot buildings available at Interurban — the more efficient footprint on the campus, and the entry point into ownership here.

Its position is arguably the best on the site. Along with Building 08, it sits most centered and most directly fronting State Highway 121, one of only four buildings on the campus with direct sign frontage on the corridor.

Approximately 3,500 square feet over two stories, delivered as The Foundry Standard: a fully finished, premium-ready headquarters that carries the same architectural character and design philosophy as the rest of the campus in a tighter, more efficient plan — grand reception and lobby, conference room, executive office, open work area, high-end kitchen with appliances and coffee bar, glass elevator, and a private interior garage.

Combine with Building 08 for a larger custom headquarters across two adjacent buildings — one address, one front door, and the flexibility to program the full footprint around your operation.

12 dedicated parking spaces, roughly 3.4 per 1,000 SF.

Following execution of the Purchase and Sale Agreement, owners may build the standard plan exactly as designed or begin a collaborative architectural, engineering and design process to tailor layout and structure around specific operational needs.

Available September 30, 2027.

Sale Notes
Ownership at Interurban | West Plano extends beyond the individual building. The campus is planned as a walkable boutique office environment on 3.5 acres within Mustang Square, at State Highway 121 and Rasor Boulevard in the Plano–Frisco corridor, centered on the future Foundry Café with hospitality-inspired gathering spaces and planned wellness amenities.

Rather than a conventional office park defined by repetition, Interurban is designed to feel like a district that evolved over time — buildings sharing one architectural language while varying in form, materiality and detail. Every owner gets a private building, a front door, and an address that belongs to their business.

Minutes from Legacy West, The Star, Grandscape, Stonebriar Centre, Toyota, Samsung and AT&T.

1st Floor - Unit BLDG 10 Office 3,500 SF $1,837,500 USD
  • Unit Size: 3,500 SF
  • Condo Use: Office
  • Price: $1,837,500 USD
  • Sale Type: Owner User
  • Price/SF: $525.00 USD
Description
Building 10 is the second of only two 3,500 square foot buildings at Interurban — the more efficient footprint on the campus, and the most accessible entry into ownership here.

It sits directly alongside Building 09, which makes it the campus's cleanest combination: take both and you have exactly 7,000 square feet across two adjacent buildings, one address, one front door, and a full footprint to program around your operation.

Approximately 3,500 square feet over two stories, delivered as The Foundry Standard: a fully finished, premium-ready headquarters that carries the same architectural character and design philosophy as the rest of the campus in a tighter, more efficient plan — reception and lobby, conference room, executive office, open work area, high-end kitchen with appliances and coffee bar, glass elevator, and a private interior garage.

12 dedicated parking spaces, roughly 3.4 per 1,000 SF.

Following execution of the Purchase and Sale Agreement, owners may build the standard plan exactly as designed or begin a collaborative architectural, engineering and design process to tailor layout and structure around specific operational needs.

Available September 30, 2027.

Sale Notes
Ownership at Interurban extends beyond the individual building. The campus is planned as a walkable boutique office environment on 3.5 acres within Mustang Square, at State Highway 121 and Rasor Boulevard in the Plano–Frisco corridor, centered on the future Foundry Café with hospitality-inspired gathering spaces and planned wellness amenities.

Rather than a conventional office park defined by repetition, Interurban is designed to feel like a district that evolved over time — buildings sharing one architectural language while varying in form, materiality and detail. Every owner gets a private building, a front door, and an address that belongs to their business.

Minutes from Legacy West, The Star, Grandscape, Stonebriar Centre, Toyota, Samsung and AT&T.

1st Floor - Unit BLDG 11 Office 3,500 SF $1,837,500 USD
  • Unit Size: 3,500 SF
  • Condo Use: Office
  • Price: $1,837,500 USD
  • Sale Type: Owner User
  • Price/SF: $525.00 USD
Description
BLDG 11 is now under reserved! Inquire for other availability/back up reservations.

Sale Notes
BLDG 11 is now under reserved! Inquire for other availability/back up reservations.

1st Floor - Unit BLDG 12 Office 3,500 SF $1,837,500 USD
  • Unit Size: 3,500 SF
  • Condo Use: Office
  • Price: $1,837,500 USD
  • Sale Type: Owner User
  • Price/SF: $525.00 USD
Description
BLDG 12 is now under reserved! Inquire for other availability/back up reservations.

Sale Notes
BLDG 12 is now under reserved! Inquire for other availability/back up reservations.

1st Floor - Unit BLDG 13 Office 3,500 SF $1,837,500 USD
  • Unit Size: 3,500 SF
  • Condo Use: Office
  • Price: $1,837,500 USD
  • Sale Type: Owner User
  • Price/SF: $525.00 USD
Description
Building 13

Sale Notes
Building 13

Description

Interurban introduces a different category of office ownership in North Texas: individually owned, standalone headquarters buildings for businesses that would rather own their address than rent it.

The campus occupies 3.5 acres within Mustang Square, the 36-acre mixed-use district at State Highway 121 and Rasor Boulevard in the Plano–Frisco corridor. Legacy West, The Star, Grandscape, Stonebriar Centre, Toyota, Samsung and AT&T are all minutes away, in one of the densest concentrations of corporate investment and professional talent in the country.

Interurban is designed to feel like a district that evolved over time rather than an office park built all at once. Buildings share a single architectural language while varying in form, materiality and detail, so every owner has a distinctive address rather than a suite number. Urban character, suburban freedom.

Twelve two-story buildings are available for purchase:

Four at 3,500 SF
Eight at 3,840 SF

There is no standard floor plan. Following execution of the Purchase and Sale Agreement, owners enter a collaborative architectural, engineering and design process that shapes the building around how their company actually operates, covering layout, structural enhancements and finishes. Two adjacent buildings can also be combined into a single headquarters of 7,000 to 7,680 SF.

Every building is delivered premium-ready, with a private entrance, two full floors and a private front balcony. A café on site serves the campus. Estimated delivery September 2027.

The result is a building that functions as a permanent business asset rather than an expense line.

Highlights

Twelve two-story buildings for sale — four at 3,500 SF, eight at 3,840 SF
Every building delivered premium-ready — glass elevator and private interior garage available.
No standard floor plan — layout drawn to your company, personalized with the architect after the PSA
Adjacent buildings can be combined into one headquarters of 7,000–7,680 SF
Mustang Square | West Plano | Minutes from Legacy West, The Star, Grandscape, Toyota, Samsung & AT&T
Own rather than lease — a permanent address and equity in the real estate your company occupies

Amenities

  • 24 Hour Access
  • Signage
  • Reception
  • Car Charging Station
  • Air Conditioning
  • Balcony
  • Fiber Optic Internet
  • Shower Facilities

Public Transportation

AirportDriveWalkDistance
Dallas Love Field 31 min - 23.2 mi
Dallas-Fort Worth International 28 min - 24.0 mi

Parking Details

Parking Available: Yes
Reserved: No
Spaces Provided: 138
Type: Surface
Included in Rent: Yes
Adam Hancock 469-564-5964 Foundry Capital LLC
Adam Hancock 469-564-5964 Foundry Capital LLC