Even if they have less than 20% ownership you can attach them to the loan to use your combined cash reserves to qualify.  

Will the STR license transfer with the property?

Car dealers give loans to anyone not legally dead, home ownership is tougher.

How many of you transferred your properties to an LLC?

How do I convert certificate to eventual ownership and time process. 

The loss in value from the sale6% to a realtor to sell the home4% for other closing costs(title work, transfer tax, etc)The other 5% in value is when you buy a new home and pay for loan processing fees, title work that have no real value.Will the new property you purchase provide more than 15% at time of purchase and over time?

What if the manager had a minimal stake in the ownership of the property?

If you sell the home, expect to lose about 10% of the value of the home in fees/costs.6% to realtor commissions, 4% in other closing costs(Transfer taxes/title costs).There may also be income taxes as a result of the sale.

I have a couple properties in my personal name that I want to transfer into an LLC that I am in the process of setting up.

Changing X LLC on title to Y LLC is a transfer deed, a sale, so property taxes are reassessed.