@Greg S. having read many of your posts I  have seen you  are a hard nosed landlord that is how you choose to run your business, glad it works for you.  

Spray foam (open-celled) is your best option for the walls, if you don't have any.  

As a man, picture shaving in front of the mirror and all you have is a pedestal sink, and no place to set down your shaving cream or razor.  

I have seen others take some double sided sticky foam tape or similar and put in as a stabilizing piece.

It is not fancy, but if night noise is too bad, you could put foam in the window... it would help cut out light too.  

Keep in mind, it is high pollen season in northern VA....but this inspector told him the ducts are dirty, pointing out wood shavings in the base of the unit...apparently from initial construction...which doesn't make sense, as I personally cleaned/vacuumed out the coils, etc.His e-mail isn't asking for payment, but it is definitely a passive way of asking.  

Cant go wrong with Honda/Acura...even the drivers seat foam seems to never breakdown...Vivianne Salazar I commend your loyalty to a stick shift......I gave mine up....the 405 freeway broke my during rush hour...but I miss that 5-speed Acura. 

@Dave Hurt looks great and you know I'm foaming at the mouth waiting to get a craft beer and burger!

The tank is filled with sand, gravel or foam and contains no oil.

Personally for a small hole whilst the house is under tenancy, we use a bit of tin foil in the hole and then sealed up with foam.