Cardi B’s mother is the proud owner of a new mansion – just outside of New York. We can’t give out the exact address, for privacy reasons. Cardi plopped down $1.5M for a New Jersey mansion for her mother. And Cardi called the date she closed on her mom’s house as the “happiest day of her life.” Cardi’s mom grew up in a run down apartment in the Bronx – now she has a newly constructed mansion – in a very exclusive neighborhood. According to the home’s listing – it has 8 bedrooms and 8 baths. The home also has…