Is it necessary to have a proper bank account in order to get a bank gurantee certificate for the regie for a lease takeover? Are there any banks that can open a bank guarantee account, without opening a standard bank account? 

I have an account with Post Finance and they do not provide the bank guarantee. I used to have an account with UBS but shut it down recently because I found it quite expensive and did not have good experience with UBS overall. Options like Smart Caution are not cost effective in my case. Will really appreciate any leads on a bank where I can open a bank guarantee account, or alternatives.  Thanks a lot!