Since you're not planning to remove the stair or lay down carpet, your focus should be on closing off air gaps, adding dense materials to block airborne sound, and absorbing reverberations inside the stairwell.One of the most effective ways to reduce airborne sound is to add mass and sealing to the underside of the staircase.

He should expect to be ordered to remove the improvements at his expense.

.: After five years, we removed a tenant (via non-renewal of lease).

I will start you off with a suggestion on your "Different": Remove all the BS salesy/advertising/marketing fluff. 

We advise removing it before listing.

In fill lots with no hair on them 9 to 12 months start to finish My 90 lot project about 5 years from dirt to completion.

Any mod can remove the link if I'm overstepping.

Remove them now.5.

Although, skimming over the requirements it might not make sense - Owner occupied, 700 max sqft of livable space, can't remove parking to do so.

This prevents the unit from overworking to compensate for accumulated heat.Essential Maintenance Tasks- Check Thermostat Batteries: Weak or dead batteries can prevent your system from operating correctly- Clear Air Vents: Remove any covers and ensure vents are not blocked by furniture or other obstructions- Replace the Air Filter: A clogged filter drastically reduces efficiency.