Looking for lower price range and willing to have a longer transportation.

Proving to the carrier that the building is a lower risk through methods like the wind mitigation report is your best bet to get a lower price without sacrificing coverage. 

However, I can think of two good reasons why you would want to pay off your mortgage early: 1) Let's just assume it is a lump sum and you pay off your 30-year mortgage with a few years left - this may result in a nice ROI (like paying off remaining 20k would result in a 5k/year gain), and 2) you are close to retiring and are okay with putting your cash into your property and want to have lower monthly expenses.  

Ne t option is lower cash flow of $300 in B class area that needs no repairs, minor or major.

Our tech scene may not yet truly rival that of the Bay Area, but the California markets are quickly pricing themselves out of some promising young talent - talent that has started looking east for lower overheads and a more dynamic, inclusive, culture.

In one case for instance the assessor's office calcuated the square footage of a duplex I purchase and when I did a phyical measurement and calculation I came up with a slightly lower number.

Loosing 1 month of rent (never mind paying commission to get a new renter) would lower your annual return to 5% and 2% if you have to pay a commission to re-lease it. 

On the surface, the corporate tax rate of 21% may be lower than the UDFI tax rate.

More modest size loans will not increase your return as much but it will be at lower risk. 

Looking at the numbers, if you rent on the lower end of your range ($2,600) you may be just breaking even.