IE theft, frozen pipes, damage etc...Higher turnover costs than apartmentsResidential mortgage amount is capped at 10 per personMulti Family ProsA few vacancies are easily carried by the other occupied unitBuilding always has people inside of it which keeps it safer from theft, damage, vandalism etc...Built to produce incomeFinancing amount is essentially unlimitedCheaper unit turnoversMulti Family ConsHigher barrier to entry (expensive)Tenants live on top of each other (you now need to be the referee)Tenants are more transientSmaller buyer pool when you are ready to sell  

If the account does not have sufficient funds or is indeed frozen, document this.

@Jerry SwansonThe rule of thumb for first deals is only bet money you can afford to lose.So whether your use your heloc will be based on your risk tolerance in regards to your primary residence, and your ability to pay the additional interest long term should things go south.There's also a possibility of the line getting frozen if you get in trouble and start missing payments.Although reducing or canceling a HELOC is prohibited by Regulation Z, a lender can modify a HELOC when they have a good reason to do so. 

I also took advantage the the Chap tax credit the city offers to keep the taxes frozen at the as is value for 10 years which stays with the property and benefits the buyer.

I recommend you make sure the place gets properly heated while water is on and also recommend that they actually turn off the interior house shut-off when not in use to avoid frozen burst pipes and also an unattended leak that could cause lots of damage.

@Dan Handford lots of damage has been done to businesses and the economy but with all the federal money being pumped in combined with frozen payments (auto, utility, mortgage, student debt), we are not feeling the pain yet.

I drove a 1990 Ford Tempo before and all through law school (2012-2015), split $650 rent with three other guys, ate frozen dinners, and was able to avoid taking out any student loans.

Tenant shall reimburse Landlord for all costs incurred by Landlord in repairing or replacing frozen pipes serving Premises if such freezing is the fault of Tenant, Tenant's family, employees, agents or guest.7.

This could be years that you are frozen in place.

So you're literally frozen, losing $ - this thing needs to be sold with a quickness.