Turnkey property question - strategy for selling - pricing??

[Jill H.]

Turnkey Markup question:

Selling two of my properties here in Georgia.  The market is coming up in the area which is great. I think I am ready to sell.  Both has been rented, tenant has been in the house for 3+ years.  The other tenant has been in the house for 1 year on a 2 year lease.  The houses are in average condition, great neighborhood and newer 2002.  They were flips I decided to hold.

Questions:

Is it true I can ask for a higher price if the property has good tenants in place and the property is in average shape.  "Can I get more for the houses than market price - markeup"?   

If I can get over market price for turn-key --- How much higher is the norm over market - Markup??

How do you determine a selling price on a rental that is turn-key --- Are other formulas or factors involved for markup?

Thank you for any advice and strategy or method.  I really need help on this one.