Within the city of Pismo Beach, an authentic treehouse stands tall. And the one-bedroom, one-bath dwelling, built around an old oak tree, is just one feature of this expansive property.

The site also includes a main house, a museum, a carriage house and a studio apartment. That’s five homes in one! Amy Gallagher of Century 21 Hometown Realty is overseeing the sale of this Pismo Beach paradise, listed for $3.8 million.