This job is typically 100% commission, but being that it is not an entry level position and I am an entry level candidate, they have offered me a decent sized salary to supplement me until I can establish a foundation in my area.

With the size of the land it is possible to build 4 townhouse style homes much like the neighborhood surrounding the property.

For a property of this size, I would not expect that you would need to set aside $20,000 for closing.  

That's very dependent on the market, size of the property, class of neighborhood (low or high quality finishes) and end use of said property (rental or flip).

You also need an egress window or door of sufficient size, a smoke detector and a carbon monoxide detector (if you have gas heat/appliances).

You dont need to have a permit for a legal size egress window.

Stack cash out AND 2-4 unit AND big loan size AND investment property, and you MAY just fall off the top of the rate sheet entirely.Let's say it's an owner occupied SFR cash out refi loan amount below $510k.

Most of the houses are single level, 2-3 bedrooms on similar size lots. 

I am guessing by the price, rents, and size that it is most likely in the Rose Village area or nearby Clark College.

Your big box stores will have some in stock, you just have to cut them to size, cut a sink hole in them, and install.