Seeing the need that nobody else sees

Jack De. Boer is credited with inventing the extended stay hotel market, a concept initially dismissed by traditional hoteliers. Despite skepticism, he saw a market opportunity and persevered, leading to the success of such hotels, which now make up 10% of the US hotel market. His vision resulted in the creation of the Marriott Residence Inn, showcasing his marketing genius.

How did Jack De Boer prove that his idea for extended stay hotels was viable?

What is the name of the hotel chain that Jack De Boer created?