The key is not to pocket the extra cash but use it either to grow, as a downpayment on the next one, or paydown your mortgage essentially turn it to a 15 year mortgage by yourself but without having the added pressure...If you do mockup calculations of how to grow as fast as possible you will see that leveraging is the way to go.

You can have it rekeyed to match the existing one, or make sure your tenants get keys before you change it.2.

. -  definitely make sure to put key words in your post. 

The key is to establish a good relationship and communicate what you need from them. 

The agent(s) take the keys/lock box with them to the closing.

There was a key word I used that brought me to join Biggerpockets.

A lot of keys look alike.

Manufactures have the option of switching to better insulation (high-density closed cell foam, vacuum insulated panels, etc) and could exceed the new benchmarks without making the tanks physically larger.

The key is repetition.

If that's the case, turn key is not what I meant to ask about.