The lease contract for the facade house expired, and the landlord asked me to remove all the decorations.

First, your first question belongs to the problem of attachment in the property law, which belongs to the combination of movable property and immovable property. According to Article 86 of the General Principles of Civil Law, if the non-property owner adds attachments to other people's property and the property owner agrees to add them, if there is an agreement on how to deal with the attachments when returning the property, it shall be handled according to the agreement; If there is no agreement and negotiation fails, it can be dismantled or ordered to be dismantled; Those that cannot be dismantled can also be discounted to the property owner.

In your case,

1. Your decoration must be irremovable. If you don't rent it, you can ask the landlord to give you corresponding compensation. The basis here should be unjust enrichment, not the terms of the contract, because this clause does not stipulate your relationship with the landlord.

Your decoration compensation clause is valid between you, but it can't be against a third party, that is, the next lessee. Because this is actually transferring the burden of your landlord to a third person, which seems unfair.

Second, the second question Because the landlord is the owner of the house, she can certainly set such restrictions on her own house. If you can't accept it, you can of course choose not to renew it.