The only condition applicable is the requirement that, in the 90 day period preceding the second anniversary of the grant of permanent resident status (not the date of marriage), the couple file an I-751 Application to Lift Conditions on Permanent Resident Status. This is effectively USCIS’s way of making the couple check back in with them, in the case of a recent marriage, to insure that they did not make a mistake about the bona fides of the marriage