His wife didn't want to live in the home, so instead they lived next door for 40 years. Together, they have six kids and the boat house clocks in at just 550 square feet.
But it does have two bedrooms, two bathrooms, a small kitchen, a dining room, a fireplace and a lighthouse.
Over the years, Kortsch renovated the home with help from friends and tenants. It has original hardwood floors, oak paneling and a new roof.
The downstairs also has terrazzo flooring that Kortsch's grandfather installed. Kortsch says he hopes the next buyer will either live in the home, or open it up to the public. He doesn't want someone who is going to try and profit off the house.
"Even if they didn't want to live there, if they wanted to buy it and have the public see it," he said. "Because everybody asks me 'can we see the inside,' well sure!"
Kortsch is now 90-years-old. He lost his wife a few months ago and said he realized it's time to pull up anchor on the Boat House.