There's no law that prevents it. Some leases have a provision prohibiting changing the locks, but don't expect a judge to enforce it. The prudent landlord would not want a key, since he shouldn't be entering without the tenant's permission anyway, and, preferably, with the tenant there. If he doesn't have a key, the tenant cannot accuse him of unlawful entry. So, yes.
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.
can a landlord change the locks on a commercial building without notice
No, the executor has no right to change a will. Only the testator can change a will.
no
Not in any state I know of.
If the landlord provided a key to the tenant, then the tenant must provide a key to the landlord. In fact, under most state laws the tenant may not change a lock without the landlord's permission and a duplicate key provided to the landlord.
You indicate they have "Contact", but what is the status of Custody? If the Father has visitation, partial or shared custody, legal& or physical....No, you cannot change the Surname of the child without the Fathers explicit consent!!
I can only answer for Massachusetts, but I think you can. The landlord has a right of entry, but he should get the permission of tenant, and the tenant has a right to be there at the time. If the landlord needs to get in during an emergency, perhaps he should be calling the police.
Yes a 16 year old can legally change their surname without consent I know this as I took legal advice on behalf of my daughter so she can change hers at 16.
A king can not impose taxes without its consent
THE ANWSER NO WAY
No, a landlord cannot change the locks for abandonment if the tenant has not moved out of the rental property. Changing locks without proper legal process could be considered an illegal eviction and may expose the landlord to legal consequences.