So by 8:30AM, I was bothering the nice tenants with a lot of noise digging out the old post and planning the project. The lamppost was rotted and the lantern fixture was pretty banged up, so there was no salvage.
After checking with two HOME Depots, there was no stock lamppost to be found, so I grabbed a leftover 4x4 from the Tommy O deck, notched that for the wire and trimmed it with some 1x6 pressure treated stock that I bought along with a new fixture.
Jim Bob Peabody lent a hand snaking the wire, and Tommy O brought over his post level. The result is this classically understated and custom crafted lamppost at 32 Beverly Ave. .... All done in one day.... MOAM style.
I get by with a little help from my Friends.