I've heard 10%-20% is the average net gain but I just want to be more clear about it. 

Proximity to the beach matters as well!

My full-time gig is to invest in income-producing websites (digital real estate) and I'm working backwards to first increase the authority of my website to then eventually rank organically in Google.Given my experience building sites, I personally don't think SEO is as complicated as any agency makes it out to be.

I expect it to be similar to real estate farming.  

I sold a property last year that required the owner to get a certificate of nonconformity to be a legal two family.

I think that would be the simplest way to go.

They also may be able to offer higher liability limits. 

Ask your GC for periodic updates to make sure everything is on schedule and to be able to know when something will set you back.

You are AT LEAST 10X more likely to do something personally to get yourself sued than your property is.

We are talking with a couple of clients about doing build to rent for them right now.