According to the Parks Department, this house is "one of fourteen remaining Dutch Colonial farmhouses in Kings County. . . . The house remains structurally sound and virtually unchanged from the time Hendrick Lott constructed it in 1800, incorporating a section of the 1720 homestead built by his grandfather, Johannes Lott."
A sign posted nearby says that the grounds are currently being restored "to evoke the Lott family's farmstead landscape . . . [including] a vegetable garden, orchard, hedgerow, windbreak, ornamental plantings, a portion of the farm drive, an outhouse and a wellhouse." You can see the landscape plan here.
Looks like they’ve already completed the outhouse.