Meet Tributary Real Estate

Founded in 2015, Tributary Real Estate is a Denver-based fully integrated commercial real estate firm. Our team of seasoned industry leaders is committed to client-focused brokerage services, quality development, and attractive investment opportunities throughout the Denver Metro area.

Our Core Values

Show Up  •  Advocacy Always  •  Do the Right Thing  •  Team Above Self  •  Give Back

Andy Cullen
Andy CullenPartner / Managing Broker
As a partner and managing broker of Tributary Real Estate, Andy Cullen offers more than 17 years of experience in commercial real estate. Andy leads Tributary’s integrated brokerage and investment strategy, supporting the success of the team in delivering positive results for clients through a personalized service model.
Amy Aldridge
Amy AldridgePartner
As a partner at Tributary Real Estate, Amy Aldridge offers more than 13 years of experience in commercial real estate as a licensed broker. Amy drives the company’s continued growth through an integrated approach to brokerage and investment services.
Jona Behm
Jona BehmSenior Broker
With more than eight years of commercial real estate experience in Denver, Jona Behm brings significant market knowledge and expertise to the Tributary Real Estate team. In her role as senior broker, Jona brings her talent for fostering relationships to assist clients in developing and executing real estate transaction strategies that ultimately position them for success.
Mark Floersch
Mark FloerschSenior Broker
Mark Floersch brings more than 14 years of office tenant representation experience to his role as a senior broker at Tributary Real Estate. His results-oriented approach and ability to deliver solutions that align with each client’s unique business goals and objectives have earned him the trust and loyalty of an extensive client base.
Natalie Froland
Natalie FrolandSenior Broker
Natalie Froland (formerly Natalie Geer) brings extensive business analytics and transaction management experience to the Tributary Real Estate team. In her role as a senior broker, Natalie primarily focuses on tenant and buyer representation, working to ensure clients are represented and supported through the entire transaction.
Jake Gustafson
Jake GustafsonSenior Broker
Jake Gustafson brings valuable sales and marketing experience to his role as a senior broker with Tributary Real Estate. An energetic self-starter and born leader, Jake recognizes the importance of developing lasting relationships and in achieving shared success. Jake assists on the business development side of Tributary, helping to expand the firm’s dynamic network of business owners within the Denver community.
Grant Oliver
Grant OliverAssociate Broker
Grant Oliver brings a wealth of business development experience in multiple segments of the market to his role as an associate broker with Tributary Real Estate. Driven by a passion for helping others succeed, he builds lasting relationships with clients through his personalized approach and valuable market insight.
Michael Harpole
Michael HarpoleAssociate Broker
With a background in project management and analytics, Mike Harpole brings a unique perspective to his role as an associate broker with Tributary Real Estate. A motivated self-starter with a strong aptitude for problem-solving, Mike believes in the power of strategic thinking and maintaining close client relationships to achieve success.
Nellie List
Nellie ListAnalyst
As an analyst with Tributary Real Estate, Nellie List helps support a team of eight brokers. In her role, she provides transaction support, delivers financial analyses, coordinates property tours, and more. With a communications background, she also leads the marketing efforts for Tributary’s properties.