On the ground-floor of the main gatehouse into Whitehall Palace, according to L&M’s Companion volume. I assume this is the Great/Whitehall Gate.
The overlays that highlight 17th century London features are approximate and derived from Wenceslaus Hollar’s maps:
Open location in Google Maps: 51.504889, -0.126085
The Porter's Lodge was on the ground floor under the Gate [to Whitehall Palace]. It was occasionally used as a prison. Sir Edmund Berry Godfrey in 1669 caused the king's physician, Sir Alexander Frasier, to be arrested for £30 due to him for firewood. Pepys states that the bailiffs were whipped by the King's command, and that Godfrey hardly escaped the same punishment. He was, however, confined for a time in the Porter's Lodge at Whitehall. http://www.british-history.ac.uk/survey-london/vo…
Chart showing the number of references in each month of the diary’s entries.