The prices vary greatly in the area you are considering. Does it have a view (Glassel Park, Highland Park, Mt Washington, Montecito Heights, Echo Park or Silverlake) or is it in the flats-such as ares near downtown near USC). There are many many variables. I just listed a new construction similar to yours. It's location-location-location. If you need an anaylsis on the projected selling price of a home on your lot a Realtor (such as my self) would need to know the location and design. If you want to set up a time to go over your project, let me know.
The Carrabba Group
Keller Williams Hollywood Hills