I was more curious on more land programs that discuss things like this for the actual land. 

Personally I like the Section 8 program when the property is located in a super poor area with a ton of blight and crime.

Lastly and before you think I am going to sell you a training program that cost thousands of dollars.  

The replacement cost (cost to rebuild, not the value of the property) data providers are pegging the quadplex at close to $2M and most 1-4 unit rental property insurance programs tap out at $1-1.5M before you'd end up in a commercial insurance product.

Using the search function gave me this, hope it helps https://www.biggerpockets.com/forums/62/topics/1211224-nyc-c...

It is currently a glorified finished attic with little room- Use addition and raise it up and extend it to the side of the home for more finished space and room for deck, washer/dryer room etc- Make the living space as functional as possible with the added sqft- Add outside living structures like deckThis is a fairly wealthily area and I want to maximize my ROIWhat are some things you recommend for a large scale project like this and what are some hurdles ?

Our team works exclusively with out-of-town investors and have the support program in place to help build a strong portfolio.

It is our goal to deliver all of this in the RTR Academy along with a plethora of benefits to students to include:-VIP access to RTR inventory before the general public-ability to earn back course fees through investing & our attractive referral program-tax, legal & investing advice from our team of attorney, CPAs & investment advisors-no cost SDIRA or solo 401(k) account to invest through retirement vehicles -lifetime membership with no ongoing or additional fees, etc.!

Either would be a great option; I'd probably choose Roseville because it's more established, but the City of Elk Grove deserves a lot of credit for its impactful growth programs, so it wouldn't be a bad option. 

Find a down payment assistance program and see what that looks like.