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VerifiedLawFirms editorial: Focus and practice areas — The firm works with small and medium-sized companies, entrepreneurs, and startups across Texas.

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Address Automatically Confirmed 2026-07-28
Phone number Automatically Confirmed 2026-07-28

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About The South Texas Business Lawyers

The South Texas Business Lawyers is a business law firm based in San Antonio, Texas. It works with small and medium-sized companies, entrepreneurs, and startups on the legal matters that come up in forming and running a business.

Its services include business formation and entity selection, contract drafting and review, mergers and acquisitions, and healthcare transactions such as physician service agreements. The firm also offers outside general counsel on a virtual basis and runs membership programs, educational courses, blogs, and a podcast for business owners. The practice is led by attorney Matthew Duke, who holds a Juris Doctor and a Master of Business Administration and has been licensed to practice law in Texas since 2008.

His experience covers business formation, acquisitions and sales, securities and venture capital financing, partnership matters, and healthcare agreements, and he currently serves as outside general counsel for five organizations. The team includes associates, a paralegal, and administrative staff. The firm keeps its main office in downtown San Antonio at 110 E Houston Street, with additional offices in Georgetown and Brownsville, and it serves clients across Texas, including Dallas and Houston, often working with them virtually.

Editor's Review

VerifiedLawFirms editorial

Focus and practice areas

The firm works with small and medium-sized companies, entrepreneurs, and startups across Texas. Its work centers on the legal questions that come up while forming and running a business. The named services include business formation and entity selection, incorporations, contract drafting and review, mergers and acquisitions, and business litigation with dispute resolution.

Healthcare law is part of the mix, and the firm lists physician service agreements as a specific area. That pairing of business and healthcare work suits medical practices that run as companies. Entity selection, at a general level, means choosing among structures such as an LLC, a corporation, or a partnership, and each choice carries its own tax and liability effects.

Contract drafting and review covers the agreements a business signs with customers, vendors, and staff. In my opinion, keeping that work with the same firm that formed the company helps when a later dispute turns on the wording of an early agreement. Mergers and acquisitions matters generally move through valuation, due diligence, and a signed purchase agreement, and a business lawyer coordinates those stages with the parties.

Healthcare transactions

Physician service agreements set the terms under which a doctor joins or contracts with a practice. They cover pay, duties, and the handling of a later departure. Texas rules on how physicians and practices can structure these deals add a layer that a general business template can miss, which is why firms that name healthcare work treat it as its own area.

Business separation and partnership matters

The firm also handles the harder moments between owners. Its material names minority owner buyouts, work aimed at preventing business dissolution, and partnership and joint venture matters. These situations come up when co-owners disagree about direction, money, or an exit.

A minority owner buyout usually turns on how the business is valued and what the operating or partnership agreement already says. Preventing a dissolution can mean restructuring ownership or settling a dispute before a court winds the company down. A lawyer who drafts the formation documents and also handles these exits gives an owner one contact for both ends of the relationship.

Joint venture matters bring two businesses together for a shared project while each keeps its own identity. The paperwork sets who contributes what, how profit gets split, and how the venture ends. Clear terms at the start give both sides a reference if the plan changes later.

How the team is built

Matthew Duke leads the practice as managing attorney. He holds a Juris Doctor and a Master of Business Administration, and he has been licensed to practice law in Texas since 2008. That business degree alongside the law degree fits a firm built around company clients.

Duke advises businesses on both day to day contract questions and full outside general counsel engagements. He currently works as outside general counsel for five organizations, which means he stays on as an ongoing legal contact for those companies. His stated experience covers business formation, acquisitions and sales, securities and venture capital financing, partnership matters, and healthcare agreements.

Two associates, Connor McQuage and Candace Castillo, work alongside him on the legal team. Gabriel Garza works as a paralegal, and the firm also lists a marketing coordinator and an intern. As a reviewer, I read that staffing as a small firm that keeps day to day support in house.

The outside general counsel model

The outside general counsel model gives a company a standing lawyer on a subscription or retainer basis. The firm handles routine contracts, questions, and filings under that arrangement. Duke's five current engagements show the firm runs this model in practice, alongside its project work.

Where the firm works

The firm keeps its main office in downtown San Antonio, with two more offices in Georgetown and Brownsville. Those locations place the firm in central Texas, San Antonio, and the Rio Grande Valley. The firm serves clients across the state, including Dallas and Houston, and it often works with them virtually.

Virtual service matters for the outside general counsel model, where a lawyer stays available to a company by phone and video while based elsewhere. For a business owner in a city without a nearby office, that setup keeps the lawyer within reach. The three offices and the remote option give the firm a workable way to cover a large state.

Resources for business owners

Beyond client files, the firm runs programs aimed at business owners directly. Its material describes membership programs, educational courses, blogs, and a podcast. These channels explain common legal points to founders who want to understand a contract or a formation choice before they call.

This teaching side fits the outside general counsel approach, where the goal is steady guidance across the year. A course or a podcast episode can answer a routine question and leave the paid work for matters that need it. The firm builds much of its content around the day to day concerns of running a company.

A podcast and a set of courses also signal how the firm prefers to communicate. Written and audio explainers reach owners who research a topic before hiring anyone. The membership programs point to an ongoing relationship with clients who want steady access to legal help.

What the public record shows

The site presents a clear picture of a business focused practice led by a lawyer with both legal and business training. It names its attorneys, its support staff, and its practice areas, and it gives three office locations. The site does not list a founding year.

The 2008 date is Matthew Duke's Texas licensure, a personal credential. For a business owner weighing this firm, the checkable facts are the practice areas, the managing attorney's credentials, and the outside general counsel work for five current organizations. Duke has practiced law in Texas since 2008 and holds a JD and an MBA.

Contact information and listing details

The directory gives the San Antonio street address as 110 E Houston Street. Read together with the city and state fields, the full location is 110 E Houston Street, San Antonio, Texas. This exact address gives prospective clients a specific destination when arranging an in-person visit.

The phone number appears twice in the source record. One entry uses the format "(210) 761-6294," while the other reads "210-761-6294." Both entries contain the same ten digits, so they identify one contact number rather than separate telephone lines. The 210 area code also matches the San Antonio location named in the listing.

The firm's website is https://www.thesouthtexasbusinesslawyers.com. The domain uses the same name shown in the directory, which makes the connection between the listing and the firm's online material direct. A prospective client can use that site alongside the telephone number when choosing how to make initial contact.

The contact record is straightforward because the business name, web address, city, and telephone area code align. The directory calls the practice "The South Texas Business Lawyers," and the website repeats that wording in its domain. The San Antonio city field also corresponds with the 210 number. Those matching details help distinguish this listing from firms with similar business law descriptions elsewhere in Texas.

For someone comparing firms through directory entries, the exact street line adds useful detail beyond the broader office geography. It identifies the Houston Street location attached to the San Antonio listing and provides a concrete reference for correspondence or a planned meeting. The telephone entry offers a direct alternative for a client who wants to contact the office without beginning through the website.

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Candace Castillo Associate

Candace Castillo is an Associate at The South Texas Business Lawyers, a business law firm based in San Antonio, Texas.

Connor McQuage Associate
Matthew Duke Managing Attorney

Matthew Duke holds a Juris Doctor and a Master of Business Administration and has been licensed to practice law in Texas since 2008. He advises small and medium-sized Texas businesses on matters ranging from day to day contract questions to outside general counsel engagements, and he currently serves as outside general counsel for five organizations. His work has included business formation, mergers and acquisitions, securities and venture capital financing, and healthcare transactions such as physician service agreements.

Contact The South Texas Business Lawyers

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Address

110 E Houston Street
San Antonio, TX 78205

Map of 110 E Houston Street, San Antonio, TX (see the address above for a text alternative).