“If I buy a house for say 1M, and the vendor will lend me 100k, would he get a 2nd mortgage/caveat/joint venture/etc?”
— a “promissory note” is recommended as confirmation of the loan arrangement between you and the vendor.
If the vendors debt is subordinate only to a primary lender [i.e. bank] – there are no other institutional lenders involved, then a provision can be included in the promissory note whereby the vendor is second to the primary lender in terms of repayment.
— Caveat: Latin for “let him beware.” in real estate transactions, it is a formal warning against the performance of specified acts.
For example, a caveat is usually lodged by the purchaser to protect his/her interest soon after an option to purchase a property is exercised or a sale/purchase agreement is signed.
— Michael