原因我怕background check 不强，sublease， summer再 sublease...，万一一个criminal risk人住进来...
我建以 先一个人签，等找到人再让landlord or management 查一下background，再加一个cosigner，重签。
safety 和 financial responsibility 对你孩子更好。If the other person does not pay rent, landlord can go after cosigner. Your son has an extra layer of protection.
