Metal buildings will be easiest and most cost effective but you need to research your market to make sure you build the right configuration for the potential use and prospective tenant.

And, this involves everything you care about:  stocks, real-estate, business dev, commodities (oil, precious metals, minerals, etc), estate planning, asset protection.  

In addition to the extra layer of drywall and sound insulation there are vibration clips that are installed under the joists and then a metal furring channel is installed running the length of the ceiling.

Buy-  Fellow had a 90 unit location, House, and a metal building. 

Then your metal wheels will start turning.

I could have played so many death metal shows, save money to invest in real estate and get tatted tf up lol instead of wasting $400 on a single chemistry book for a semester and studying useless stuff.

I worked for IBM servicing their machines at Alameda Cty computer room where I first met Al Florida.

Once I discovered from a friendly corner conversation that the neighborhood was built during the post-WWII metal shortage and all the sewer pipes were made from clay.

I think instances like this is exactly what @Jim K. and other's keep calling out, the false notion of iron clad security from such entities.

Most other precious metals are produced at far greater rate than the demand because of the artificially high prices.