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This is part of the exodus of assets. Folks are not buying, or spending less in NYC. They want out. Even investors are shying away from this real estate. They want to avoid being caught up in personal income tax problem. Having a home in NYC can put a target on folks even if they claim another home as their permanent residence.
Folks need to keep detailed calendars in case they receive an inquisitive letter from NYC/NYS. This division is quite aggressive and actually wins close to 50% of their cases.
Even if they have good records from a taxpayer, they do often subpoena your cell phone records and have an agent "count the pings" on a cell phone to try and establish residency to get their pound of flesh.
There are app’s you can get that can help keep track of where you are in relation to where you claim as your residency. Short of that most people leave an electronic footprint of where they are, and have been.