Architectural monument D-4-71-142-14
"Former Franciscan hospice, two-storey two-wing complex with hipped roof, solid and plastered, square corner pilasters, window frames, 18th century, church set up in the basement in 1731, expanded in 1776/77, roof turret 1781; with furnishings; stately barn, solid and plastered, hipped roof, 18th century; surrounding wall, 18th century."
Source: Bavarian State Office for Monument Preservation
The special feature is the church on the ground floor of the wing on the street, which is still in use. Unfortunately the door was locked, I would have liked to have taken a look inside.
A little more history, given the scarcity of sources:
“Burggrub in the district court of Ebermannstadt, with a mixed religious denomination, is located on the Leinleiter in a pleasant valley, has 24 houses, 2 pubs (the best is the one by the bridge), 143 inhabitants, including those of Rothenstein, and a small church. There used to be a Franciscan hospice near the same, which was founded by the Schenk von Stauffenberg. Burggrub was Schlüsselberg; in 1350 this place was mostly owned by the nobles of Schaumberg, who sold it to Voit and Peter von Streitberg around 1500. In the Peasants' War of 1525, the Streitberg castle was destroyed, but soon rebuilt. After the extinction of this family, its property reverted to Bamberg. In 1691, it was handed over to the Schenk von Stauffenberg family, who still have a patrimonial court there. Due to neglect, it burned down in 1747 and remained in ruins. Nearby, on a free-standing, split, high rock, stood Rothenstein Castle."
Source: Josef Heller (1829)