But here's another -Mineral rights and Oil and gas interests also typically qualify as real estate for 1031 treatment.  

Mine rents for $800 per unit ---tenant pays water and electricity.

Low water pressure is because of the mineral buildup in your galvanized water lines.

Some of the rights to uses of this may have been voluntarily sold and separated in the past (ex mineral rights) or taken for the public good (ex flyover rights). 

I do like to go to Mineral King on occasion.

I have seen this before, or maybe just removed a nail that actually punctured one long ago, but that actually sealed up from mineral deposits and didn't actually leak at the time.

All mine rent for more than $700/month. 

Unfortunately, the best time to sell in a certain geographical location/or investment type is usually the worst time to buy.  1031 can be used to move locations geographically of from one type of investment real estate class into another such as residential to commercial or agricultural or even mineral and oil interests.Other than that there are some products you can research such as TIC properties, Delaware Statutory Trusts, Land leases.  

And here in Colorado, especially in more rural areas, they know about water and mineral rights issues that are far outside of my general experience.

this should soften it. use a plastic spackle knife not a metal one (scratches....) to scrape it.now the next one is to find out what can dissolve the glue/adhesive....try water, mineral spirits, goo-gone, vegetable oil... unless you want to sand/refinish the floors. than you can go gorilla on it with a big scrapper