.  :-)  Laziness helps the economy! 

So a 14 trillion dollar economy in the US plus the global economy will overnight switch to crypto currencies that are backed by anonymous hackers somewhere?

All that money will be infused into the local economy.

Right now, the economy at large is enjoying a time of low unemployment and increased housing values, which may make places like Auburn look better than it is, but I would guess when/if there is a downturn, the types of tenants you would get would be some of the first on the chopping block when companies look to 'cut costs'.

I could tease this out more, but the main reasons are 1) a down economy, 2) an emerging economy, 3) AAA property locations, 4) lack of credit available, and 5) historical buildings (very sturdy construction, 3-4.5m ceilings, etc) that are very undervalued at the moment for mostly aesthetic reasons that can be fixed quite easily.

If the person loses their job or a down turn in the economy you are wiped out.

I understand how in a post recession economy it would work great, however now that the market has (largely) recovered are there still plenty of subject to deals around that would make sense to an investor?

If that passes, watch a complete crash of the tourism economy and property values.

For fulfillment you can do it yourself to save money if you are broke, but ultimately if you want better response rates and focusing your time on value-add, then you will want to outsource fulfillment to a shop that has economies of scale and can offer you great rates.

Additional upside can be found in the areas you mentioned - ease of access, economy of scale with service providers, time efficiency for management, possibly offering additional price points in your portfolio, ...Contiguous property is worth more to adjacent owners.