property ownership person or LLC

couple of friends got together and bought 2 properties in our personal names, since interest is low compared to buying in the name of LLC. now we want to convert the ownership to llc but keep the mortgage in our names. I heard quick claim is way to do it but illegal.
another way is to write a management agreement signed by all partners that llc ownes the property. I have been trying to find such form in internet but couldn’t find it. anybody knows where to find such form.
or is there any other way to make it legal that property is owned by llc and morgage by persons listed in it.

Thanks for all your time.