A Foundation on Which to Build

A Foundation on Which to Build



Integrity, quality, and community involvement

Integrity, quality, and community involvement



Inspired by tradition, emboldened by opportunity

Inspired by tradition, emboldened by opportunity

Relationships built on trust. Investor partnerships that build returns. Developments that build economic engines for the communities we live and work in.

It’s a history of honesty, determination, and expertise. It’s the foundation we’re building on.

Platinum Advisors, headquartered in Scottsdale, Arizona, is a diversified development company in the Southwest, US. Platinum is focused on the acquisition and development of projects including mixed-use entertainment, industrial/flex, office, retail,  investment properties, and mid-rise residential projects.

Since its debut in 1994, the company has grown from a mid-size office condo developer to a nationally recognized mixed-use developer. Rebranding as Platinum Advisors in 2010 allowed the company to further emphasize its strategic partnerships and developments within the commercial and residential areas, as well as the depth of expertise, proven track record, and respected management team.

Platinum Advisors operates under the continued leadership of Founder and CEO Jim Riggs



Platinum Advisors LLC has a multi-level approach to project approval that appeases all stakeholders and likewise gains positive momentum for the project. It is essential to gain the trust of these groups, so the project is protected “behind the scenes.” The approach focuses on the engagement of key stakeholders, public community groups, and non-profits, and community businesses.



The backbone of development is to define and understand the community and neighborhood before proposing any plans. Once the character of the community is established, we define the consultation plan and engage both the proponents and opponents of the community. By seeking out opponents of the project early, we can quantify the problems and forecast how to handle the proponents and opponents in the neighborhood.



The construction process allows total control over each aspect of the development phase. The systematic process allows for checks and balances throughout the development of The Pernicano. Our depth of knowledge in the development arena offers years of experience, Construction management and forecasting is the most important measure in the preliminary phases of the development as it allows us to value engineer the project in the most efficient manner.



Platinum Advisors LLC focuses on the relationships within the team to execute the sales, leasing, and marketing strategy for the new development. These team members are chosen at the inception of the project in order for a cohesive team to work through and understand the development from the initial phases and design review.

Our Services

Platinum Advisors Projects Overview

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Capital Invested And Managed
New Projects Under Development
Years Of Experience

Our Executive Team

Jim Riggs

Founder & CEO

Jim started his real estate career in New Jersey after completing his law degree at Georgetown University. He turned entrepreneurial vision into reality in 1998 by moving to Arizona and pioneering the development of office condominiums. SAXA (formerly Shea Commercial) became the largest developer of office condominiums in the US with 5 offices in the Southwest and 75 projects.

In 2010 he rebranded as Platinum Advisors, a real estate investment and advisory firm, to create innovative real estate partnerships focused on revitalization projects, amusement attractions, distressed retail centers and mixed use commercial/multi-family projects. Jim has over 34 years of experience and has been recognized 3 times as Arizona NAIOP “Developer of the Year”, Phoenix Business Journal’s “Forty under 40”  and “Talk of the Town” awards. 

Jim resides in Scottsdale with his wife, has 5 children and is active in local charities including St Patricks Church and a board member of The Greater Scottsdale Boys & Girls Club for over 18 years. He is an avid Philly sports fan and enjoys golf, pickleball, Hot Yoga, and Jersey Shore summers.

Tonianne Strohkirch

VP Of Real Estate

In 2002, Tonianne launched her career in real estate development by collaborating in a startup environment to create a multi-state office condo development firm. She progressed to be a part of Senior leadership and help Shea Commercial become the nation’s largest developer of office condominiums. She has a track record of success in acquisitions, redevelopment, dispositions and property management. Her comprehensive background in real estate projects has been essential to the strategy of multiple real estate firms and many of her projects have won special recognition and awards.

Tonianne resides in Gilbert, AZ with her husband and daughter. They typically spend their winters snowboarding and summers exploring Arizona’s high country, hiking and fly fishing.

Tonianne obtained a degree in Business and Communications from ASU in 2001 and holds an Arizona Real Estate Brokers license.

Ryan Riggs

Commercial Asset

Ryan is an Arizona native and has five years of Brokerage, Development, and Asset Management experience. Upon graduating from the University of Arizona with a degree in Business Management, Ryan began his career in the insurance industry. He quickly realized his true passion was real estate development and pivoted to pursue development opportunities in a family business. As an asset manager he has contributed to the profitably of numerous projects in Scottsdale and Dallas. Ryan was recently accepted to Arizona State University’s Masters in Real Estate Development program for the fall of 2023 and is eager to take his career to the next level. 

Ryan lives in Scottsdale and spends his free-time mainly playing or watching baseball, basketball and golf. Ryan also enjoys doing hot yoga and trying new restaurant concepts.

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