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New York StateUnified Court System

Finding the Multiple Dwelling Registration (MDR) for your building

1. Go to the NYC Department of Housing Preservation & Development website at Department’s website at


2. In the center where it says: HPDONLINE, put in your building information.

3. Click on “Registration” in the left side menu.


4. The MDR number is located in the top right of the screen.

5. The Managing Agent information is located in the Summary Report.