I just put them in my storage area and replace the next fridge that goes bad. 

We'll whoever installed it used a hot water heater instead of a boiler for the heat, most likely to save money on the unit.Quotes I'm getting are between $7,500 - $10k to replace the whole system with a combi unit and done correctly - which is a massive nut for something I thought I had a solid 10-15 years before having to replace.  

For CAPEX think roof replacement, HVAC replacement, big things that you'll save for overtime. 

In addition, the water main line is rusted and would need replacing.

Also, and while I haven't tried to permit a container building myself, I've been told by people who have that, because it's out of the ordinary for them, the city will require all the engineering drawings and stamps from an engineer registered in Oregon.  

Is it worth paying a structural engineer to assess to be able to develop a scope and cost estimate, and if the number work out it's do-able?

I am an engineer and currently work for a major ag/construction/lawn equipment manufacturer (I'll leave it to you to guess which one) at one of their factories in my area. 

Hello allI recently got an level 2 inspection of a chimney and they are saying I need to tear down and rebuild the roofline and up on this chimney (5,000 repair)and if I don’t in a year or two it will just spread like cancer and I will have to have the whole thing replaced (12-15k).  

In the situation where the parents are exchanging into a TIC in the replacement property, this seems to be a different situation since it's actually the parents LLC which is taking title to real property via the TIC, so if an heir was to invest in the property as an LP I feel the IRS may view this differently but am not sure.

Planning, zoning, engineering, building dept, tax assessor, etc.