WHELAN SECURITY CO.
ActiveBusiness · Dallas / Dallas County, TX
At a glance
Public records place WHELAN SECURITY CO. at 2 active locations in 2 Dallas office buildings. Locations include MOCKINGBIRD TOWERS (STE 300); TOLLHILL II WEST (STE 296).
Public record — Dallas / Dallas County
Office locations (2 active)
| Building | Suite / floor | Submarket | Since | Source | Match |
|---|---|---|---|---|---|
| MOCKINGBIRD TOWERS1341 W MOCKINGBIRD LN | STE 300 | Dallas | Mar 2024 | Texas sales-tax permit | address · medium |
| TOLLHILL II WEST5310 HARVEST HILL RD | STE 296 | Dallas | Jun 2009 | Texas sales-tax permit | address · medium |
Where does WHELAN SECURITY CO. operate in Dallas?
The earliest active record dates from Jun 2009 and the most recent from Mar 2024.
Across Dallas, 7,686 active business locations are matched to office buildings; WHELAN SECURITY CO. accounts for 2 of them.
How does BuildingCensus know WHELAN SECURITY CO. is at these addresses?
Each location is a business record whose premises address was matched to a county office parcel (record types on this page: Texas sales-tax permit). The match method and confidence are shown on every row.
A record at an address is evidence that the business operates there, not a lease: records lag moves by months, and businesses without a local record at an address do not appear.
Frequently asked questions
Where are WHELAN SECURITY CO.'s offices in Dallas?
Public records place WHELAN SECURITY CO. at 2 active locations in Dallas / Dallas County: MOCKINGBIRD TOWERS (STE 300); TOLLHILL II WEST (STE 296).
How long has WHELAN SECURITY CO. been at its Dallas locations?
The earliest active record starts Jun 2009; the newest Mar 2024. Start dates are when the record was opened, which can trail the actual move-in.
Related
Data provenance — public records only
- Dallas / Dallas County — Dallas Central Appraisal District certified bundle (owner names, mailing addresses, building classes, gross and net-lease areas, values). Texas non-disclosure means no sale prices exist in any public record, and no universal business licence means no tenant layer. A partial tenant layer comes from the Texas Comptroller's active sales-tax permit roll: suite-level business locations, but only firms with taxable sales — professional services without them do not appear.
Every fact on this page is drawn from the government records above — no listing sites, no scraped platforms, no third-party images. Facts from public records are uncopyrightable; each tenancy row carries its source and match confidence. Records can lag reality — a business-tax receipt or registration at an address is evidence of occupancy, not a lease confirmation.
Dataset updated . Locations from Dallas / Dallas County business records matched to county office parcels.
About this data
Source: Dallas Central Appraisal District certified bundle (Dallas / Dallas County), as published September 21, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “WHELAN SECURITY CO. — Dallas office locations”, https://buildingcensus.com/offices/dallas/companies/whelan-security-co (data as of September 21, 2026).