What happens if he refuses to sign for certified mail or isn't around at the time of delivery and then doesn't go to "retrieve" the mail? 

As far as drugs, I would deal with it in a non-curable breach of contract section such as: Non-Curable Breach of Agreement: Any of the following events will be deemed a non-curable breach of this Lease; (a) Police raid upon your Premises; (b) Your arrest for possession/sale/storage of any narcotic/controlled substance/chemical or herbal contraband in or about the Premises; (c) Failure topermit Owner's entry to the Premises following receipt of adequate notice; (d) Failure to cooperate with Owner or any pest controller/fumigator/exterminator following receipt of notice of such services; (e) Defaults by you causing Owner to serve more than two notices to pay or quit, in any twelve (12) month period; (f) A misrepresentation on your Rental Application; (g) Delivery of any security door/gate key to anyone not party to this Lease.

Hey Christina -We'll generally do one delivery from Home Depot for all our finish materials (light fixtures, plumbing fixtures, appliances, etc).

He did agree to guarantee the boiler for 2 years bc other people have also expressed concern about it.

No one expressed undue frustration from what I gleaned, anyway.

Therefore, if a defect in the foreclosure process is discovered after the trustee has accepted a bid, but prior to the delivery of the trustee's sale, the trustee can abort the sale, return any funds received to the purchaser, plus interest, and process another foreclosure."

Implied terms can't override expressed terms, but you really don't have a sale contract if you avoid the obligation to buy. 

I am respectively and professional agreeing to disagree with some of the opinions expressed in this discussion. 

I can't express enough how delighted she was with the finished product.

If buyer does not purchase title insurance, buyer will receive a Quitclaim Deed or equivalent, with no express or implied warranties of title".