I want to do this with the utmost respect, professionalism, fairness, and diplomacy, 

Diplomacy and respect is the key to success whence dealing withy buearacrats and civil servants.

Thanks for your diplomacy and advice which I will heed

Tact and diplomacy are the keywords here.

The normal dynamic of a an adult conversation with diplomacy does not apply here .

Diplomacy is not my gift.

The requirements are pretty clearly stated on the checklist, the problem is that few people take the time to read them and adhere to them... or make the first-timer mistake of assuming that 'they don't really check this stuff' (Protip: They do.)The only real value of an expeditor is their ability to practice diplomacy in the building department, and the value of not having to go and talk to the intake personnel yourself (AKA: Time savings).

If the tenant is blowing off only some steam and you have the ability to communicate with the tenant to defuse him then use diplomacy to build a better relationship.What I am trying to say is; when the treats are only the result of tenants blowing off some steam and the threats don't apply to any situation where you are actually violating real estate laws, then take their threat with a grain of salt, send the tenants a letter stating that if they have any issues that violate any laws or rights then the tell the tenants you are willing to address any valid situation they claim.I evicted many tenants for looking at me cross-eyed (so-to-speak) at me and there was a few times I evicted tenants I shot myself in the foot because it took me 6 months to find a new tenant and I lost about $8,000.

., I liked your non-diplomacy better!

Diplomacy but firm are the two key words.