He's also the developer and this is the first house in Phase II of this development.

U have to find developments that are purpose built for investors..

I'm trying to understand how they collect data so as to develop the best comping practices.

Duplex Development Made Easy - SB 9 permits property owners to convert single-family lots into duplexes.

You could put in a range of numbers for purchase price and closing costs, renovation expenses, and expected returns and you could very quickly get a range of projected return on investments (although an excel spreadsheet could easily do this as well), but I'm sure as technology develops we will see even more sophistication in AI's ability to assist in deal analyzing.

Curious to know opinions from real estate agents, flippers, developers and anyone in the know regarding what home buyers generally would prefer.

Should I play harder and get into land development?  

You can also find various contracts online, develop your own then have an attorney review it to ensure it has teeth, and is legal in your area.7.

The end goal is to have a piece of land with multiple houses: one for my growing family but also a home for my mother in law.My mother in law has agreed to foot the money on a new property/land up front and when ready we can buy land from her to build/develop etc. 

I personally recommend checking Columbus OH - lots of job growth, population growth, and major companies moving and developing here.