Get a great inspector in, and have them go over the place with a fine tooth comb

Seems fine.

A letter should be fine. 

This a small West Texas community (Everybody know everyone) and there's simply not a hundreds vacant properties.We don't send out many mailers anymore in our market but when we did, handwritten letters did get the best response.More generic mailers are fine as long as you have some sort of 'call to action' i.e. asking them to check your website, landing page,  etc.

In this case it is fine with me. 

If you're concerned about late or missed payments in your market consider incentives to make sure payment is received on time, a minor discount, 12 months on time payments = a gift card at Christmas, etc, etc.Also check your local laws when it comes to fines and specific 'grace periods', you may not have much of a choice in the matter.Good luck!

As long as it's somewhere close to that you are fine.  

As far as the boric acid, it may work fine for ants.

For example, we require No Smoking, and the management company we work with has a $10,000 fine for smoking (things like that that help get the kind of tenants we’re looking for).Thanks for sharing your story & experience.  

If you use the "cash flow" process espoused by BiggerPockets and taught in Brandon's webinars, you'll be fine even during a market downturn.