The world’s largest marina operator didn’t have to look very far to find a new partner in the second largest privately-held company in the US.

Safe Harbor Marinas announced on Tuesday that Koch Real Estate Investments, an affiliate of Koch Industries, Inc. had completed an investment in the company. Both companies are based in Dallas, Texas.

"We are excited to welcome Koch to our team," said Baxter Underwood, CEO of Safe Harbor Marinas in a statement released by the company. "We spent several months evaluating potential investment partners for the next phase of our company's growth and development; Koch emerged as the favorite given their long-term perspective, high standard of excellence, and integrity. Together, we will continue building something truly special in this industry."

The investment occurred shortly after Safe Harbor added a 70th property to its growing portfolio, which now includes marinas in 18 states.

For Koch, the investment in Safe Harbor represents acknowledgment of the company's considerable potential for growth. "We like the assets, the management team, and the industry," said Jake Francis, Managing Director of Koch Real Estate Investments. "Safe Harbor's demonstrated commitment to excellence in stewardship of these assets provides a long-term partner for Koch and we look forward to exploring future growth opportunities."

Terms of the investment were not disclosed.

Goldman Sachs & Co. LLC acted as exclusive financial advisor to Safe Harbor Marinas. Jones Day and Latham & Watkins served as legal counsel to Koch Industries and Safe Harbor Marinas, respectively.