Going through some maps I drew years ago, I found a floorplan labeled "Apartment on Pearl Alley." I can't remember where this is located, and Volo's Guide to Waterdeep doesn't have a Pearl Alley listed.
Did I make it up, or is there another source for that location?
It's the alley that runs from Slut Street up to the Three Pearls Nightclub. Although not listed in the index, it is mentioned in the description of the nightclub (p.184), and shown in the map on p. 204.