The building's history reads like a relay race of ambition. George Washington Tully Carter purchased an existing house in 1865 and added a second floor to create the hotel. A decade later, in 1875, John Evans bought the property and expanded it further, adding seven bays to what had been a three-bay structure. From 1888 until the 1930s, Jesse Palmer and Frank Bell ran the operation, and the hotel was known alternately as the Palmer Hotel and the Bell Hotel during their tenure. Each owner enlarged the footprint to meet demand, and nearly all of the original structures survive: the main building, the outbuildings, the water tower. Only the cookhouse and the livery stable have been lost to time.

The San Gregorio House was not simply a place to sleep. It was a self-contained destination in an era when the San Mateo coast was genuine wilderness, hours from any town of consequence. The saloon and dance hall suggest a social life that went well beyond fishing and hunting. The smoke house and granary hint at food preservation on a scale meant to feed large parties for extended stays. The carriage sheds accommodated the stagecoaches and private carriages that were the only way to reach the coast before the automobile. This was hospitality as infrastructure -- every building served a function that the surrounding landscape could not provide. The power house generated the hotel's own electricity. The water tower stored its own supply.

Today, the San Gregorio House sits quietly on Old Stage Road near the intersection with Highway 84, in a hamlet of 214 people. The original stagecoach stop stands across the highway from the general store, which still operates and hosts weekend music sessions. The hotel itself is privately held and not open to the public, but its presence on the National Register ensures some measure of protection. The architectural plans, preserved by the Library of Congress through the Historic American Buildings Survey, show a sprawling complex that was larger and more sophisticated than most visitors to this quiet crossroads would expect. San Gregorio was never a big town, but for a few decades in the nineteenth century, the San Gregorio House made it a destination, and the building remains the most tangible evidence of that improbable moment.