N.Y.C. Admin. Code § 25-412: § 25-412 Tax and debt limitations.

(a) The aggregate amount of outstanding indebtedness that is incurred to provide funds for capital improvements pursuant to this chapter shall be chargeable against the city's constitutional debt limit and may not exceed ten percent of the amount allowable under that limit. The aggregate amount of outstanding indebtedness that is incurred to provide funds for capital improvements pursuant to this chapter and that is chargeable against the property within the district may not exceed seven percent of the average full valuation of taxable real property in the district.

(b) The district charge, exclusive of debt service, levied in a given year against real property in a district may not exceed twenty percent of the total general city taxes levied in that year against the taxable real property in the district. The district charge so levied shall be included in the total amount, if any, that the city is permitted by law to raise in that year by a tax on real property.