Believe it or not, I live near the 42 Pct. The closest fire alarm box to my residence is 2323. I believe the street used to be referred to as 'gasoline alley' during the way years. I recall reading here that 2323 was one of the busier boxes during those years.
The old vacant court house is still there, where St. Ann's Ave and Third Ave meet, behind that new glass building. That building is Boricua College. There are also fairly new apartment buildings there, along Third Ave running from 161 St to 163 St.
There is still an old vacant warehouse behind the Days Inn, on Brook Ave. I've seen L.19 drilling there a few times.
There are also new apartment buildings along St. Ann's Ave and Eagle Ave, between 156 St and 160 St and on 161 st, Between Courtlandt and Melrose and then from Melrose to Elton.
The St. Mary's, Jackson, McKinley and Forest houses are nearby and I'm always amazed at the number of runs I hear for these buildings. It seems like there's compactor fires everyday at one or each of these buildings.
The Morris and Morrisania houses are just a bit further up on Washington, near the quarters of E.50/L.19/BC.26, and those are some very rough places.