When a marriage-based Green Card application (I-485) is approved less than 2 years after the couple was married, the applicant will receive Conditional Permanent Residence. This means that USCIS would like to verify your new marriage to ensure it is legitimate. As a result, you are required to file Form I-751 to remove these conditions on your permanent residence. This must occur in the 90-day period leading up to the expiration of your Conditional Permanent Residence.