The old original filter has disintegrated  so much it has deformed to "hug" the actual coil. 

I think it's unwise for me to even try to invest in areas that I've never drive through.Every time when I see metal net fence around house in pictures on realtor.com, I find myself backing up from even running analysis tools seriously.Would you investors recommend me to drive through east side in order to get familiarize myself with east side? 

For an adjacent larger stone building we had to recap the chimneys in metal rather then a slate cap.

Real estate works on multi-year trends, so have you tested whether it is preferable to buy precious metals only when there is a crisis, and keep buying rentals otherwise?

Getting a prefab cottage or metal building might only be 10-35/sqft.

Therefore, the self-directed IRA custodian’s role in connection with the IRA is greatly reduced to, for example, issuing annual Form 5498, processing annual valuation directive of IRA owned LLC, which is provided by the LLC manager to the custodian, and processing and reporting IRA distributions once distributions commence, to name a few.Further, holding and safekeeping fees are eliminated with respect to the alternative investment holdings, with the exception of precious metals, which the regulations require stored with an approved depository institution such as Delaware Depository.The self-directed solo 401k may not be a good option for you since Roth IRA funds cannot be transferred to a Roth solo 401k.

And it also has stucco and metal wiring in the walls. 

I priced a goodman unit for like $700).Now, I don't know if the indoor coils I have are any good...

The others seem to have recently been renovated with hardy siding, commercial carpet throughout or laminate flooring, new paint, and metal roofs (for some).

Interpreting that may require a surveyor or other professional unless you can do it yourself.A third option might be to rent a metal detector and go find the markers yourself.