I'm sure you're well versed on all this but I love the automation that Remotelock provides.

Also, I have to nudge their support to take certain actions which should be automated. 

Depending on how extensive the renovations are, in many cases the architect that draws the renovations plans and helps obtain the building permit is then allowed to supervise the works by signing a "declaration  as the responsible supervisor" and the city inspector comes at the end for a final sign off, allowing therefore for a faster construction timeline.

JimPersonally, I would just talk to the tenant and let them know that you are willing to allow them to make this improvement, and that you will assist them in the permitting process as your contribution, while making it clear that when they ultimately leave, your expectation is that the storm shelter will stay.

Need a permit to rent which includes the name of the tenant, need a permit for a vacancy, contractors need to be licensed and registered with the city to work in the city.

Also check the City's online Zoning Archive where all the history of the buildings permits and prior use and occupancy usually is located.

Make sure you know what you're getting into -- have a good grasp of zoning, permitting, setback, etc., regulations before you decide to move forward.

I have tenants in a house I bought in 83 and lived there for 10 years , these tenants have been there 16 years so far THEY have raised the rent every year 40 dollars per month , he has paved the gravel driveway ($ 6000) , put an addition on the house (with a permit) $11,000, they never missed a payment , This year he re roofed the house with 30 year shingles , All improvements were paid by him .

Don't believe your contractor to re-pipe, it will cost you around 5-7k between re-pipe and repair plus permits, spend money on leak detection after the fact.

Anyone have a recommendation for a Realtor in the Denver area (or even Aurora, Springs, etc.) that I could reach out to to be put on an automated email for multi's that pop up on the MLS?