I'd probably give more weight to their income and job stability (have they been at the same job a while, or do they bounce around?)

There should be quite a few there.For more ideas, check out @Anson Young's book Finding and Funding Great Deals: https://www.amazon.com/Anson-Young/e/B075GVTGKP/ref=dp_byline_cont_book_1

The attraction to a quad would be to spread out the weight of vacancy to 25% as opposed to 50%.

I have no weight.

You will be in this for the long term, and you want to make sure that everyone is able to pull their weight.

The property class descriptions often include age of the property as a major factor in determining property class, can you help me understand how much this weights when applying to urban areas or small east coast towns.For example, I live in the Fingerlakes, in a small town lakefront town that attracts many tourists.   

Will the rent coming in give more weight then comparable buildings?

@Randy E.

Think E*Trade or Fidelity with different paperwork.

My lot is 100x100 I am located in the middle of neighbor A and B, bordering me on the E/W.The 12x100 piece that Neighbor A own's is to the north of my lot.