Valuation of property with or without tenant

[Chris Christianson]

So I'm trying to make a leap in my investment business this summer.  The goal is to purchase a vacant double lot in a decent B+ neighborhood and build a mixed use building.  Preliminary plan is two commercial spots on main floor and 10 one bedroom apartments on upper 3 floors.  I'll be GC'ing the project and bringing in an investor or two.

Now the real issue, We have a single family, twin home, in St Paul.  We have some equity in it now so I'm thinking about selling it and rolling the proceeds into this apartment deal to reduce investor participation.  It's currently rented, lease is up in July, so my question is, should I get the lease renewed for another year and put it up for sale rented, or list it for sale first in case someone wants to move in themselves.  I'm guessing the value is not going to be much different...but I'm guessing.