Final answer:
The seller can retain a lien right and let the title pass to the buyer using a purchase money mortgage, where the seller provides financing to the buyer and takes back a mortgage on the property as security for the payment.
Step-by-step explanation:
The financing technique in which the seller would retain a lien right while financing part of the selling price, yet permit the title to pass to the buyer, is known as a purchase money mortgage. This method of financing occurs when the seller of the property provides financing to the buyer themselves, typically taking back a mortgage on the property. This means that the seller acts as the lender and, while they maintain a lien on the property to secure the loan, legal title transfers to the buyer immediately upon sale.
The seller thus has security for the payment in the form of the lien, ensuring they have collateral if the buyer defaults on the loan.