Killington, the sprawling ski resort in central Vermont, has many claims to fame: Its 4,229-foot main peak is Vermont’s second-highest mountain; it has 73 miles of ski trails and a vertical drop of over 3,000 feet; it hosts about 800,000 skiers every year.

But it has never been known for a fancy base area.

Great Gulf, a Toronto-based real estate developer, wants to change that. It is planning to invest $3 billion to build a new base village at the mountain over the next 25 years. Its renderings of the development show clusters of luxury homes, two public squares, a large open area called a “ski beach,” a fitness grove, forest spa, skating path, panoramic pool, and more than 100,000 square feet of retail and dining space along a pedestrian promenade. It is being designed by architect Mo

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