Looking to convert a SFH with a large lot into a 4plex

[Allen Lopez]

Hello, 

I have a sfh in a large lot that I would like to convert/build onto a 4plex. Has anyone ever done this? 

Any recommendations on how to approach this?

Any steps to check and get this done? Was hoping to refinance and use that to grow the property. 

Any help would be greatly appropriated.

Thank you