I was able to turn my place into two units so no shared spaced helped a lot. 

It may be best to partner with someone that has done one before or somehow is a local expert on lot splits.If you can add a bathroom into existing space on high cost property it can add a lot of value.  

Quote from @Jerome Morelos: Quote from @Robert Ellis: Quote from @Jerome Morelos: I recommend converting an existing space, like a detached garage for example, rather than building from the ground up.

Hello, I currently have an empty space (about 12 feet from the property to the sidewalk and 8+ feet wide).

I am looking to focus my investing on the commercial space specifically value add apartment complexes.

For example, I've had a couple of 3+ bedrooms sit for a longer period of time because they only had one parking space available (and no on-street options nearby).

We have no interest in contact data gathering, as that space has been well developed. 

Not a lot of municipalities allow that sort of structure as living space in our area.

@Nicholas Stout Welcome to the section 8 space!

Cold calling IMO is the easiest way to get into the space.