回複：1。可以在合約上現在就注明以後加租的程度隻要雙方同意2。沒有完美的租客。

Thanks so much! I am mostly concerned that they are "professional" tenant and and knows all the tricks to play. It would be hard for me, a rookie landlord, to evict them if they do not pay the rent later on. By the way, retired couple is typically good tenant or bad tenant?  Thanks again!