This has made me recall an anecdote . While I was in the UK , one south Asian told me that in one community , they have a saying like this " Its OK to buy the first house with the interest based loan from the bank. But , the second house is not allowed as it is not necessity !!" You see , there are many definitions of "necessity " !! May be , you should rent a scholar who will fine tune the definition of "necessity " which is most suitable for you !!!!!!! Then make a Faustian bargain Its so easy to jump into the abyss of hell !