Manhattan's rolling 30-day construction filing total swung down by roughly $88 million overnight, even as the borough added nine more job applications to the pile. The RFI Wire's own analysis of NYC Department of Buildings job filings, via NYC Open Data, shows Manhattan's 30-day filed cost at $1.87 billion as of today, down from $1.96 billion the prior cycle — a drop that has nothing to do with less work getting filed and everything to do with which single filing rolled out of the 30-day window.
The prior cycle's list of biggest filings included a $67.75 million alteration at 111 Wall Street; today's list doesn't. That's one filing aging out of the rolling window, and on a dataset where the ten biggest Manhattan filings can run from $30 million to $75 million each, losing one nine-figure-adjacent filing moves the borough total more than any real slowdown would. The citywide filing count actually rose — 11,988 filings today versus 12,093 yesterday is a small dip, but Manhattan's own count went from 4,373 to 4,364, essentially flat.
“A 30-day rolling window means the total is exquisitely sensitive to whichever mega-filing sits right on the edge, not to how much new work actually got filed that day.”
This is the same mechanical effect the desk has now caught twice this month, and it's worth naming plainly for anyone using these totals to gauge market health: a 30-day rolling window means the total is exquisitely sensitive to whichever mega-filing sits right on the edge of the window, not to how much new work actually got filed that day. Rockefeller Plaza's $74.9 million alteration, filed by Tishman Speyer, has now anchored the top of the Manhattan list for at least two straight cycles — it isn't going anywhere until it, too, ages out.
If you're pricing off these borough totals to gauge where Manhattan alteration work is headed, don't read a single day's swing as demand. Look at the filing count, not the dollar total, for the real pulse — and if you're chasing a specific mega-project's paperwork, track the filing by BIN or address, not by where it sits in a rolling total that resets on a clock nobody controls.