Buy that 3-4br SFH and rent one or two of the spare bedrooms.

It spares you the headache

They could also be spares if one gets broken, though the outer windows don't sit on the windowsill and are about 2 inches taller and wider. 

If my tenant lived the high lifestyle and didnt save up a few months emergency fund, why should I risk losing everything so they can be spared?

Check out the podcast for bigger pockets in your spare time (iTunes biggerpockets).

We had designed the site to have room for 4 parking spaces (2 full size and 2 compact), but now that one has to be a van accessible space we are having to reconfigure the site and only have room for a total of 3 spaces now. 

They are usually vibrant, mixed use, compact, walkable areas, they will have a lot of shops and restaurants/ live work space. 

In other words, he doesn't want to do it so he's giving you a price so insanely high that you almost have to say no.I don't do asphalt, but in my area you can get a concrete slab with 4" of compacted ABC for $20/sf or less.

Good idea on just keeping a spare for the next unit.

For example, a female who is renting out a spare unit may be legally allowed to choose not to rent to men, since she is living in the unit.