There are other differences also, so you would need a decent architect and/or engineer on board.Financing should be the same as a duplex, at least that is what I have been told by my bank.  

If not, the city does not have to honor the 2 family use and could require a new use permit where you would need to have an architect or civil engineer submit a new zoning plan and obtain a zoning permit. 

However, I was the Architect and acted as the GC.

I am an Architect and am currently building my own modular house.

For those that have completed a condo conversion (architects, investor, attorney etc.)

Add to the mix the utilities, architects and engineers and it is easy to get bogged down.  

It reads: Master of Real Estate Development for Architects from Woodbury University in San Diego. 

.- Then, find an architect who can help you come up with ideas on what to build to best utilize the land and create a nice "flow".- Then, find a new home builder (or a GC with new home construction experience) to come in and help you ballpark estimates on construction costs.

Not interested in picking through it myself but if they estate sale company wants to come do the sale a couple days after close my calculation is as long as they make more than $161 in a week it'll pay for itself as our holding costs are only $23/day and my architect needs time to do the drawings anyway!

I am an architect in NYC and have seen it all, they can make or break any flip/deal as far as I am concerned.