Jennifer Lopez Joins Alex Rodriguez for Business Meeting

Alex Rodriguez brought a secret weapon to a business meeting Monday ... his GF, Jennifer Lopez.

Alex arrived at the NYC office building alone just before 1 PM ... we're told for a "post baseball opportunity." J Lo arrived shortly thereafter and they left together at 1:30.

We're told A-Rod respects J Lo's business acumen and wanted her there. He's been fielding offers since his retirement and we're told this meeting was important enough that he wanted her take.