Even though the online calculators are a great tool I really want to understand the numbers I get, maybe someone can help me out?

I don't have direct comps, but other houses in the area, updated ones, have sold for closer to $700,000.

They also take time to learn the area in more than just a superficial manner.No doubt that there are "better" opportunities in areas where the numbers make more sense, but a weekend Wells Fargo "Investor Seminar" held in the Bay Area doesn't give you all the tools you need to successfully operate in a place with which you are totally unfamiliar (personal anecdote).

Terms of your 1031 are that your property must be higher value and your loan must be a similar amount to the property you sold. 

Did you occupy part of the duplex being sold?

We ended up buying a SFR in the east bay and we sold the condo.

The problem is difficulty in matching houses sold to the house I am working with (there's actually 3 houses in the same 1 mile radius).

A friend of mine just sold one of his rent houses with a repaired foundation, it sold for over market price.

As someone who sold my San Jose house in the 2002 dot com bust and has been locked out ever since by the rising market - prices have almost tripled since then - I would say hang on to it just so you are locked into the market.

I made that assumption due to the fact that when I asked him how soon is he trying to have his home sold?