Development & Companies


GMP Development & Investment, LLC

GMP Development & Investment, LLC was founded in 2021 by Tony Manthey and David Penney. The Company specializes in Acquiring, Developing, Engineering, Constructing, and Selling of Commercial and Residential properties located along the Emerald Coast of the Florida Panhandle, from Pensacola to Tallahassee.



In 2022, the Company acquired a $1.3 million Bayou Water-Front Residential Lot in Kelly Plantation, Destin, Florida. With the expertise of our Architect, Civil Engineer, and Design Team, we created a 6,720 SF 6-Bedroom/6.5-Bathroom Coastal Modern “Spec Home” with Pool and Boat Dock. RCL Development-Emerald Coast, General Contractor is our Construction Company and it is expected to be completed by August 2023.
Manthey Group has listed the home for sale at $7,799,000; for full info click below. GMP Development has many more Projects in the planning stages, and they will be announced on as they become available.



Introducing the epitome of Luxury Waterfront Living- a magnificent 6 Bedroom, 7 Bathroom Coastal Modern Home set on 520 feet of Deep Water Frontage on Jones Bayou, all with the most amazing Sunsets and Water Views of Choctawhatchee Bay. With a total of 8,917 SF and 6,651 SF of living space, this Estate Home is a true Masterpiece of Architecture, Design, and Technology.

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