No.
{| |- | No, they cannot sign the lease paperwork. They can certainly move into the apartment with the permission of the parents. And if the parents or boyfriend sign the lease, there should be no problems. |}
Likely not. If they got a better offer, or someone had cash in hand, and you had no written contract, they would be prone to take that person first.
No.No.No.No.
It depends on what you mean by a lease: if a written lease is signed by both parties for a specific term, then the terms cannot be changed without mutual consent. Even if an oral lease any changes would have to be with your consent. If you do not consent to any change of the terms of the lease you can refuse to sign it and move out.
A 'let' is probably referring to a lease (rental of a house) and therefore 'let agreed' on a sign means that someone has said they will sign a lease to rent the house and expect to be moving in shortly (ie the house is no longer available but the lease is still to be signed). Once the lase IS signed the sign will be change to just "let".
In New York, a person under 18 cannot sign a legal contract like a rental lease agreement. However, they may be able to have a parent or guardian co-sign the lease on their behalf.
Oddly enough, it depends on the term of the lease. If it's a month-to-month tenancy then yes, he can. If not, the lease is effective at time of signing and may not be changed without mutual consent.
A lease IS a contract. If you did not sign it, you do not have a lease.
You can sign a lease before someone else is expired but the lease will have to specify that the start of the renting period is after the other persons lease expired. So if the prior lease says it ends the 1st then the new lease must be dated to start after that. This is not that unusual. Most landlords want to fill the unit as quickly as possible and it can take sometime to go through the process so the will often started as soon as they can. I've done this before. Generally speaking once I get my tenant screening results back, I want to get them locked in as soon as possible.
you put up a sign that says "for lease"
You could have them sign the lease in order to stay in the house, so that they are responsible for the house as well. If you want them to move out, then make it happen--you would set up the utility in your name. Call the police and have them removed. They have no right to stay in your home / property that you occupy without your consent.