In general, every two years and 10 if you raise the rent each. The rider may be invalid. Between the parties and the lender and borrower, and is valid for all the rent increase is not automatic. Set lower than the market rent at the contract, however, significant disadvantages for the borrower when the rider to be in favor of the lender is invalid. The amount raised, for example, the borrower and the lender used a strong position, and not the result of high rates significantly higher rate compared to market value, the special form of automatic increase of the rent is to be effective. For rent can be freely set by the party, monument to the absence, so air is not HIKAEMASHOU clothing.