The home was on the market for over 200 days, the builder offered 15,000 discount.

Since you are not doing super high end finishes as mentioned, doing high end flooring and all other stuff just above builder grade does not warrant tile or full wood flooring. 

Just a builders risk policy if you are doing an extensive rehab on the property and then a landlord dwelling policy when the property is rented.

But seems tricky as none of the builders are willing to sell to investors in and around Columbus region ?

Looking to talk to someone who’s had experience adding a bonus room/sunroom in San Diego. Need some advice and some recs! Image for reference.

Regarding the HOA and CC&R's, the builder can make changes to the CC&R's pretty easily while the development is under Declarant Control.

Any residential builders looking for their next ground breaking development?

Builders in my area have told me that's generally what you can swing.

Additionally, I would like to attempt to do the process Owner/Builder with subcontracting work out as well as doing some of the work I'm comfortable with (I have some experience with bathroom & kitchen remodeling an am not new to the construction industry).

Wholesaled to a builder to build a house.