If you break a lease can a landlord add crazy charges without an agreement?

If the lease does not indicate in writing that it is assignable, without any legal implications, you would need the permission of the landlord/owner. And if agreeable, then they would need to be an assignment of lease.

Common areas - Areas of the property that are for the use of all tenants, such as lobbies, hallways, parking lots, courtyards, etc. The lease usually specifies that these areas are maintained by the landlord. The lease should clearly define common areas and provide details on the use and maintenance of these facilities.

The tenant pays all expenses in connection with the property, such as insurance, taxes, upkeep and maintenance.

There are several different ways this can be handled: one situation is that you have a base tax year and as tenant are responsible for any and all amounts over that base amount. Another scenario that the Tenant is liable for all of the taxes and associated costs. Finally, and unlikely, the tenant could have zero exposure for taxes, but that’s rare. To sum it up it is whatever you negotiate with the Landlord prior to signing any lease.

Generally speaking, a security deposit is refundable after a lease expires if the tenant complies with all of the terms and conditions of the lease. When a landlord leases a commercial building, they are giving the tenant possession of a very valuable asset and they are trusting the tenant to maintain and care for it. The deposit gives some assurance to the landlord that if the premises is damaged or rent is not paid, there is a source of money to pay the landlord. This is the general way security deposits work but the landlord and tenant can agree to substantially different terms.