I was wondering if anyone who has done this can tell me if after comparing price per sqft of the building aspect of the project only (cost of land, environmental remediation, and demo excluded) they have found modulars to be a more cost effective way to go rather than stick built.

The only problem is that I don’t know the blocks to well, I have an interesting vacant property lead on North Bond street that’s already been demoed inside.

I will pay it off and demo it and make it into a park. 

I'm buying a home that I plan to demo and built on the lot.

It has been difficult to find a mud jacking firm that will fix my leaning stoop, so am starting to consider demo and re-pour.

As a property manager I helped a new client with a portfolio he bought on default from a lender unfortunately 3 of properties were scheduled for demo already when he closed. 

How big of a house can I build on this lot if I demo the current home and build a new foundation?

My question is more centered around the demo/framing portions of the projects.

I spend hours house hunting, going to open houses, looking at comps, and demos just for fun -- so I think naturally becoming a Realtor would be in the best interest for me?

No way you'll be able to build a house for that cost (including demo) and hit the price point you need to.