For example, if someone starts a lease in January, are you negotiating an 18 month lease instead of 12 months, so that when it expires, it's the summer (and easier to re-lease than it would be in the winter)?

There is a 6th edition that was released in 2013.

This can cause a build-up of tension which get released (materials shift) suddenly making a knocking or cracking sound.  

Ask your realtor for a release of contract.  

@Evan Manship - Congrats - take some time to celebrate because the next step in the journey is about to start. 

Also as certain contingencies are released the non-refundable amount of EM can go higher and higher.

Blanket loan with release fee and amount required to clear title, he paid off one, the others hit the steps and didn't sell and went to the lender.

If I have a discussion with a seller that says there is an existing mortgage, I will ask them to sign an "Authorization to Release" which allows me to contact their lender directly for a pay-off.  

If your current tenant has some long and locked sweetheart deal in a prime space then you might not care if they go out and it might be to your advantage to make more revenue re-leasing if you have an upmarket.I can't give legal advice but there are many, many more dynamics I haven't listed that go into these types of decisions.

You simply pay off the loan and he releases his lien.