4-plex Development

[Wade Funk]

Howdy folks! I've got an opportunity to help a developer who is going to be buying, developing, and building a 4-plex community in my market. He has asked me to help market the properties. My area is a suburb of Austin, TX with little "affordable housing". The development will consist of approximately 20 buildings/4-plexes which will be managed (by the developer who has experience with this) and in a POA/HOA to help keep the development from going the route of down-trodden.

My questions:

-What are some ways to demonstrate the investment opportunity for potential buyer(s) given the lack of existing 4-plexes?  
-Is this a CapRate play, a GRM play, an IRR play, or all of the above or something I'm too naive to even know?

Thanks in advance,

Wade T. Funk