>t's a luxury tax that only affects people wealthy enough to have a second home in NYC.

Not exclusively though, right?

Since they are revising the valuation system to not artificially depress valuations, isnt this a global tax increase? No rate changes or extra tax for someone with a primary residence but the base is increasing, right?

>While the tax seems large, experts say the city’s antiquated assessment and valuation system dramatically undervalues properties, reducing the burden. City valuations can often be 10% or less of the true market value, they said.

>Rather than overhaul the system immediately, the city will gradually update valuations – and the tax – according to the budget documents. Starting in the 2028-2029 tax year, the property values will be based on comparable sales. Since valuations will skyrocket, the tax rates will fall to compensate.

Those are two different things: the new tax, and fixing the broken appraisal process.

Its part of the same law. Regardless, the appraisal changes are global, right? That is, it would apply to a $200M 17th home and a $750k residence alike, right?

No, there is no global change that I'm aware of.

Look at the article. It changes appraisals to be comparable sales. Thats how property taxes work in general for NYC. Do you see anything that says this change is scoped to these 2nd homes over 1M? I cant find that specified anywhere - it only mentions the general method.

Yes it is proposed for only the new second home tax. It does not currently exist at all.