Described in A Dictionary of London (1918) at British History Online:
West out of Bishopsgate Street, at No. 91. In Bishopsgate Ward (Within) (Hatton, 1708-O.S. 1848-51).
The site is shown on the O.S. 1875.
Former name : “Black Bull Inn” (1615, H. MSS. Com. 8th Rep. 435b. Strype, ed. 1720 I. ii. 105 and 107).
Strype uses both names.
Hatton, 1708, describes it as a passage to Broad Street.
Site is now occupied by Palmerston House.
Black Bull Inn can be seen in the lower-left corner of this 17th century map.