Hopefully you still have a trickle into your emergency fund instead of putting all your savings into loan payments.

Establish a good emergency fund to ensure that if all their investments fail and they have no income (worst case) they can survive for six months minimum. 

For things like cold/heat snaps, I am sure to have back up fans/space heaters to use in emergency situations and have it available for guests or easily accessible that they can grab themselves if I am not available to deliver it.

You would want to hold onto it and wait for a better market to sell it in UNLESS 1) selling it will relieve you of a massive headache and is worth the loss in cash, 2) selling it will allow you to invest funds in a bigger and better deal (happy scenario) or 3) some life circumstance happens and you just need cash bad, for medical or a home emergency (sad scenario) - people are selling stuff at a loss everyday because they really need/want the cash for something else.  

In the event of a real maintenance emergency I'd like them to be prompted for something along the lines of "Press 1 if this is an emergency" and have it ring forward to another number for an on-call maintenance person. 

A cash offer can definitely help close the deal, but make sure you still have a decent emergency fund and funds for rehab if necessary.  

.- It's the ultimate "emergency fund" - DiversificationIf you do roll it over, just make sure you buy a low-expense index fund.

I have about $15,000 outside of my emergency fund that I feel comfortable putting towards a deal.  

I'd play with Geothermal, if I were doing new construction or a large rehab on multi-family.a typical 1.5Ton unit will have a 3-4.5KW emergency strip for those days when the temp is well below 32F

Most I've seen are 10 years-It sounds like there's some type of annual review so staying on top of DTI ratio would be big, this is what makes me nervous about Johnson Bank is I feel like if anything were to happen to my income for even a short period I would be frozen even though I have a nice emergency fund/stock $ to fund anything that could happen-If you want a new appraisal done you have to pay the $425-I could do a slower version of my initial strategy (have my current mortgage and a 2nd lien Heloc with them; pay chunks of principal only payments to my mortgage and then every $10k I add in equity I could refi my Heloc to up that line of credit)-DTI 43% or less-You can have up to 6 Heloc's open before you're considered commercial-Could basically use a Heloc like a checking acct. if you wishAfter finding out more it seems to me like a 1st lien Heloc would be perfect for a person/couple who cash flow a lot of money, aren't investing too much in real estate, and want to pay off their mortgage fast.I'm cash flowing a decent amount and want to build a good portfolio of real estate. so having hundred of thousands tied up into a variable rate may not be my best option.