4521 State Highway 121 - The Foundry | Plano Offices 1,920 - 7,000 SF Office Condo Units Offered at $1,152,000 - $3,675,000 Per Unit in Plano, TX 75024

Building 01 is the most flexible site at Interurban. Open land adjacent to the building means an owner isn't limited to the standard footprint: Designed at approximately 7,000 square feet of custom headquarters shaped around your operation. It is also one of the only positions on the campus that can accommodate a rear patio — private outdoor space attached to your own building.

It carries direct sign frontage on State Highway 121, one of only four buildings on the campus with that visibility.

Delivered as The Foundry Standard: a fully finished, premium-ready headquarters designed to accommodate a wide range of businesses from day one — grand reception and lobby, large conference room, executive office wing, expansive open work area, high-end kitchen with appliances and coffee bar, glass elevator, and a private interior garage.

13 dedicated parking spaces at the standard 3,840 SF build.

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 — here, that process can extend to the building envelope itself, not just the interior layout.

Available September 30, 2027.

Interurban 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.

Building 03, Suite A introduces a new ownership concept to the Texas commercial market: the commercial villa.

Approximately 1,920 square feet across two stories, Suite A combines the privacy and architectural presence of a standalone headquarters with a more efficient ownership footprint — designed for businesses that want something distinctly different from a traditional office condo, flex suite, or multi-tenant building.

The ground floor is anchored by a private one-car interior garage designed for true dual-purpose use. Keep it as secure enclosed parking, or program the space as an oversized boardroom, showroom, studio, or additional workspace. A private office and restroom complete the first floor, with a long floating staircase creating a dramatic transition to the level above.

The second floor opens into a highly customizable workplace with configurations accommodating approximately four to six private offices, open workspace, and direct access to a private balcony.

Every commercial villa at Interurban will have its own architectural identity. Urban-inspired front elevations combine mixed metals, premium stucco, expansive glass, and layered materials to create a collection of individually distinctive buildings unified by the design language of the campus.

Following execution of the Purchase and Sale Agreement, owners may work collaboratively through the architectural, engineering, and design process to customize the interior floor plan around their specific operation.

1,920 SF | Two Stories | Private Balcony | Interior Garage | Customizable Floor Plan

Building 03 may also be purchased in its entirety for $2,016,000, offering approximately 3,840 square feet across both commercial villas and the opportunity to create a larger, fully customized headquarters under single ownership.

Available September 30, 2027.

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.

The ground floor of Building 06 is the only food-and-beverage space at Interurban — the campus living room, and the one address every owner and tenant on the site walks to.

Approximately 1,920 square feet on the ground floor of a two-story building, positioned as the social center of a 3.5-acre boutique office campus within Mustang Square, at State Highway 121 and Rasor Boulevard.

The demand here is built in rather than hoped for. Interurban delivers four individually owned headquarters buildings and fourteen leasable office suites, all within a short walk — a captive weekday population with no competing option on the campus. Occupants receive preferred pricing, catering and event setup assistance, and complimentary delivery, which turns the café into the default for client meetings, team lunches and after-hours events across the site.

The second floor above is held for lease as an urban-concept office space, and the building is served by a glass elevator.

Delivered as part of a campus designed around hospitality as infrastructure rather than as an afterthought — the café was planned into Interurban from the beginning, not added to fill a vacancy.

Available September 30, 2027.

Currently under contract.

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.

Building 08 is one of only four buildings at Interurban with direct sign frontage on State Highway 121 — a permanent, high-visibility address on one of North Texas' busiest corridors, and something no amount of leased space will give you.

Approximately 3,840 square feet over two stories, delivered as The Foundry Standard: a fully finished, premium-ready headquarters designed to accommodate a wide range of businesses from day one. The standard plan includes a grand reception and lobby, a large conference room, an executive office wing, an expansive open work area, a high-end kitchen with appliances and coffee bar, a glass elevator, and a private interior garage.

Combine with Building 07 for a single 7,680 SF custom headquarters — two adjacent buildings, one address, one front door, with the flexibility to program the whole footprint around your operation.

13 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.

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.

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.

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.

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.

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.