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Can one get a house mortgage without buying a house?
Not unless you have something else to put up as collateral. The bank wants a basic assurance that you're not going to immediately move the money to the Caymans and disappear. 999 times out of 1000, the collateral for a home mortgage is the home itself (which you wouldn't be able to take with you if you decided to disappear), so signing up for a 30 year mortgage on a nonexistent house is probably going to get you laughed out of the bank. It's sometimes possible to negotiate something else as collateral; you may, for instance, have a portfolio of securities worth the loan principal, that you can put in escrow for the term of the loan (the securities will stay in your name and make you money, but if you default on the loan the bank goes to the escrow company and takes the portfolio for their own). The bank will consider the risk of value loss on the securities in the portfolio, and may ask for a higher collateral value or only allow a lower loan amount. In all cases, it's usually a bad idea to go into long-term personal debt just to get "cheap money" that you can use to beat the interest rate with some business plan or investment. If you have a business plan, take that to the bank with an LLC and ask for a business loan. The business itself, if the plan is sound, should become valuable, and the terms of business loans take that into account, allowing for a "shrinking collateral" transferring the initial personal risk of the loan to the business.