It was around the corner from the main box, so I just stuck up a little note for a while that said "mail addressed to unit B should go in the box around the corner".

Are there ways to address this concern or to communicate the value of these unique features to the appraiser effectively—without overstepping?

When you get your appraisal, post your appraised value and value of property without the ADU and ideally the address.  

@Ryan Leake please address material participation as it relates to being a co - project manager throughout the construction of a new STVR.

Google "nyc dob bis" and when you get to the website type in your borough, street and address.

@Karen Seguin, it all depends on what you are trying to convey to your tenants.At minimum, any welcome letter should provide updated contact info for maintenance requests and mailing address for rent payments, and if the legal notice address is different than lease, include that.This can also be a good way to politely remind people of any general rules that you expect them to adhere to.  

In particular I am seeking help for the following;1) "Provide an evacuation plan (shall include Site address, floor plan//site map, escape route(s), meeting placeoutside the home, emergency number 9-1-1).

This is only one area of real estate that should be addressed, and it typically involves premises liability/property management type claims.

., should foundation work be done before addressing anything else?

However, when I put in my address, rather than taking the houses listed near me, it is pulling houses in that higher priced area (even though there are tons of houses listed near me).So with that said, I am considering an airdna membership.Thoughts?