Annual Property Lien Sale Don't let tax, water or repair charges come between you and your property. Read more about the lien sale and the properties that may be included in this year's lien sale on May 17, 2013. Learn MoreACRIS System Update The ACRIS system will be unavailable from 5pm Thursday until 8am on Monday while we upgrade to a new version. Read more about the new version and enhancements. Learn MoreRead Our New Property Tax Guides! Learn how your property is valued and how we calculate your property taxes. Download the NYC Residential Property Tax Guides. Learn More