From the 2020 Instructions https://www.revenue.state.mn.us/sites/default/files/2021-02/m1pr_inst_20.pdf
Sign Your Return Sign your return at the bottom of the second page of the form. Your spouse must also sign if you file jointly. Send Your Return to:
Minnesota Property Tax Refund
Mail Station 0020
600 N. Robert St.
St. Paul, MN [social security number removed]
