$1.$ Your client is preparing to purchase a $1,000,000$ sq$.$ foot building in midtown.$$ You have been asked to advise about some of the legal ramifications of obtaining financing on the building.

a$.$ Your client asks you explain $($define$)$ a mortgage and explain its major elements. $($Hint there are at least two $(2)$ major elements$)$

b$.$ Your client says he may want to sell or $$flip$$ the building soon after closing and would want to sell the fee with the mortgage intact. He is concerned about the effect that a $$Due on Sale$$ or alienation clause may have on the mortgage in that instance. Explain what a $$Due on Sale$$ clause is and what may cause it to be invoked.

c$.$ Your client is concerned that he may default sometime on his mortgage. Explain his rights and obligations in a foreclosure action and what rights of redemption he may have.