Funding type
This project is privately funded, on private land for private use.
ADC-HQ in Richardson, TX
3400 N CENTRAL EXPY, SUITE 470, Richardson, TX, 75080
ADC-HQ is a renovation/alteration project at 3400 N CENTRAL EXPY, SUITE 470, Richardson, in Dallas County, TX, tracked from its Texas Department of Licensing and Regulation (TDLR) registration. Under construction, estimated completion Dec 2026. The project has an estimated value of $12.0M across about 36,128 sq ft.
- Estimated project value
- $12.0M
About this figure
Estimated construction cost supplied in the TDLR filing. This is not a current property appraisal or a final construction invoice.
- Reported floor area
- 36,128 ft²
About this figure
Square footage reported for this scope of work. It may cover only part of a larger property.
- Estimated cost / ft²
- $332/sqft
About this figure
Calculated from this filing’s estimated cost divided by its reported square footage. Available only when both figures are supplied; it is not a market benchmark.
- Scheduled duration
- 4 months
About this figure
The interval between the filed start and completion dates. These dates describe the proposed schedule and do not measure actual construction progress.
The project record
Project timeline
Explore filed milestones and scheduled dates. Open a milestone for its source.
4 timeline dates shown.
Project registered · TDLR filing
Registration of the project with the Texas Department of Licensing and Regulation.
Source: TDLR filing
View source recordScheduled construction start · Scheduled date
A date supplied in the filing; this does not confirm that work started or finished.
38 days after the preceding date shown.
Source: TDLR filing
View source recordReview complete · TDLR filing
The filing records completion of the accessibility review.
29 days after the preceding date shown.
Source: TDLR filing
View source recordScheduled completion · Scheduled date
A date supplied in the filing; this does not confirm that work started or finished.
93 days after the preceding date shown.
Source: TDLR filing
View source record
📰About ADC-HQ
Adc-Hq is a $12,000,000 interior renovation of a corporate workplace at 3400 N Central Expwy, Suite 470, in Richardson. The project covers 36,128 square feet of space within the 3400 Property LLC facility. Work is scheduled to finish in December 2026, following a start date of August 2026. The TDLR record shows the project status as Review Complete, with plan review finalized in September 2026.
The renovation is privately funded and located on private land for private use. Zeller is listed as the owner and developer of record. Corgan serves as the design firm for the project. Fred Dean Shinault is the registered accessibility specialist associated with this filing.
Project Scale and Cost Context
The estimated cost of $12,000,000 places this renovation in the top quarter of similar filings in Dallas County. The median estimated cost for renovation and alteration projects in the county is $248,000. The median size for these projects is 4,226 square feet, while the median cost per square foot is $72. This project’s cost per square foot is $332, which is above the county median. The scheduled build window of 122 days is longer than the county median of 92 days for similar work.
Zeller has four other TDLR-registered projects totaling $6,015,414. These include Lonza Biologics and Lonza Houston in Houston, as well as 3400 at City Line and 3400 Cityline in Richardson. Corgan has six other registered projects totaling $99,999,000. Notable examples include Mockingbird Oak Park multifamily and retail developments in Dallas, and Crosspoint Building 1 in Georgetown. The 75080 ZIP code has a population of about 52,746 people. The median household income for this area is $89,773, with a median owner-occupied home value of $420,000.
Dallas County unemployment was 3.3 percent in July 2026, higher than a year earlier. The project registration with TDLR occurred in July 2026. The scope of work is strictly defined as interior renovation of a corporate workplace. No exterior structural changes or new construction are indicated in the filing. The project remains a private commercial endeavor within the Richardson business district.
Review Complete
Design review complete, construction may proceed
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ADC-HQ is a Renovation/Alteration project located at 3400 N CENTRAL EXPY, SUITE 470, Richardson, TX 75080 in Richardson, Texas. The project has an estimated value of $12.0M covering 36,128 sq ft. Zeller is the property owner and Corgan is the design firm of record. The project was registered with TDLR on July 24, 2026.
Frequently Asked Questions
What is the estimated cost of the Adc-Hq renovation?
The estimated cost for the interior renovation is $12,000,000. This figure is listed in the TDLR filing for the project located at 3400 N Central Expwy in Richardson.
Who is the design firm for this project?
Corgan is the design firm of record for the Adc-Hq renovation. They are responsible for the design aspects of the 36,128 square foot interior workplace update.
Is the project located in a flood zone?
The site coordinates place it in zone X according to the National Flood Hazard Layer data.
What is the scope of the work?
The scope of work is an interior renovation of a corporate workplace. The filing does not indicate any exterior construction or structural additions to the 3400 Property LLC facility.
When is the construction scheduled to finish?
Construction is scheduled to finish in December 2026. Work started in August 2026, and TDLR completed plan review in September 2026.
What is ADC-HQ?
ADC-HQ is a renovation/alteration project at 3400 N CENTRAL EXPY, SUITE 470 in Richardson, Texas, registered with the Texas Department of Licensing and Regulation (TDLR). Scope of work: Interior renovation of a corporate workplace.
Is ADC-HQ open in Richardson?
ADC-HQ is still under construction in Richardson, TX, with an estimated completion of Dec 2026 according to its TDLR registration.
Where is ADC-HQ located?
ADC-HQ is located at 3400 N CENTRAL EXPY, SUITE 470, Richardson, TX, 75080, in Dallas County.
Who is the owner or developer of ADC-HQ?
Zeller is the property owner/developer of record for ADC-HQ, per its TDLR project registration.
Who is the architect or design firm for ADC-HQ?
Corgan is the design firm of record for ADC-HQ, according to its TDLR filing.
How much does ADC-HQ cost and how big is it?
ADC-HQ has an estimated construction value of $12.0M and approximately 36,128 square feet (about $332/sqft), based on its TDLR filing.
Scope of Work
Interior renovation of a corporate workplace.
Note: This project is registered under the Texas Accessibility Standards (TAS) program. TDLR registration is required for commercial and public facility construction to ensure compliance with accessibility requirements under Texas Government Code Chapter 469.
Location & views
3400 N CENTRAL EXPY, SUITE 470, Richardson, TX, 75080
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