Partner Companies-old


We are honored to work alongside organizations that share our vision and support our model for ownership and growth. The eight Partner Companies listed below operate together at STO Building Group.


STO Building Group

GIS’s CMAR platform, the STO Building Group, includes a family of 7 companies with over 1,900 employees located in offices throughout the US, Canada, UK and Ireland providing a complete range of services, from site selection analysis, design constructability review and aesthetic enhancements to interior fit-outs, new building construction and building infrastructure upgrades and modernization.


Structure Tone

Structure Tone was founded in New York City in 1971 as an interior and renovation construction company. Although the early 1970s were challenging economic times, Structure Tone flourished. Today, the firm is annually ranked as one of the top five contractors in New York City, and for nearly a decade, ranked as the #1 Interior Contractor by ENR. Structure Tone’s proven expertise managing construction in one of the world’s most challenging and dynamic regions is unmatched.

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LF Driscoll

Founded in 1929, LF Driscoll is the leading full-service construction provider in the Philadelphia metropolitan area. The firm specializes in the commercial, healthcare, cultural and higher education market sectors. Regarded as one of the nation’s leading healthcare facility builders, LF Driscoll offers the full range of construction management services to leading healthcare providers across the eastern and southwestern regions of the United States. With 90 years of construction expertise, LF Driscoll’s in-house capabilities guarantee each project’s quality, safety, schedule and budget.

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Over the past 60 years, Ajax Building Corporation has established its presence throughout the United States and is now one of the Southeast region’s premier contractors. One of the fastest growing construction companies in the region, Ajax specializes in the educational, municipal, healthcare and cultural sectors. Whether the firm is renovating an existing facility or constructing a new complex, Ajax prides itself on delivering projects on time, within budget and with the highest level of safety, customer service and quality.

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Founded in 1896, Pavarini North East Construction boasts a long history of providing the highest quality construction management and general contracting services to the northeastern United States. Today, 70% of the firm’s business stems from existing clients, which they support from offices in Stamford and Hartford, CT. From interior fit-outs and renovations to new building construction and infrastructure rehabilitations, Pavarini North East offers outstanding client services on every project.

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Govan Brown

Govan Brown is a full-service, Canadian construction management firm specializing in commercial interiors for the corporate, retail, and hospitality markets. Since 1994, the firm has completed thousands of projects for various clients from almost every industry.  From boutique shops and vendor kiosks to multi-floor office fit-outs, their expertise and experience ensures each project is executed seamlessly and to highest standards.

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LF Driscoll Healthcare

LF Driscoll Healthcare combines LF Driscoll’s 90 years of experience building complex health systems with the Structure Tone organization’s breadth of local relationships and purchasing power. Together, these partnered firms offer unified teams of healthcare building experts to their clients across the nation.

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Structure Tone Southwest

Structure Tone Southwest is a full-service general contracting firm providing the complete range of construction expertise since 1977. Most of the firm’s business is generated from repeat clients, who they support from the four major business centers of Texas: Austin, San Antonio, Dallas and Houston. With over 200 construction experts on staff, Structure Tone Southwest provides the highest quality project management and client services on every project.

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Pavarini McGovern

Pavarini McGovern provides construction management services for new buildings, major expansions and renewal projects in the New York metropolitan area. A firm made up of expert builders dedicated to the construction of enduring, high-quality buildings, Pavarini McGovern brings passion and creativity to each and every project. This approach allows them to deliver elegant solutions to complex construction challenges. As a result, PMG has built some of the finest and most imaginative structures in the area, earning their reputation for construction excellence.

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