I suggest try to come up with the 50K already para tapos na usapan mo with the seller.
Ending kasi a big chunk of money is already with the seller and you will pay in installment the balance yet ano hawak mo? OR/CR still remains with the owner diba? Kasi ako din hindi ko ibibigay unless paid in full na.
Unless gaya sabi sa itaas magkakilala kayo personally and you trust each other.