This is a combination of a house hack and live in flip with added value causing forced appreciation. 

There will be several interest rate hike in 2018 causing a slow down in home affordability.

"Undetermined" might be way longer than you want, and you should make sure the lease is yours and includes provisions for raising rent, eviction for cause, etc.

I'm just wondering how I can respond that won't cause any issues.  

If you are concerned about it, establish a new LLC for the property, and use the old LLC for a different property. 

Hello everyone, I am a fairly newly licensed MA Realtor and am about to purchase my first multi-family property in Western Massachusetts.I’ve done some flips in the past that I’ve lived in and resold years later, but this will be my first multi family property to rent out, and I’ll be buying it cash.Without it being financed, I have some additional concerns over keeping things anonymous and ensuring that an LLC is set up properly for protection.A local real estate attorney has quoted me $1,000 to establish an LLC, in addition to the MA filing fee.

Hi everyone, i wish i had found this forum earlier. I have fully paid off my primary residence and have secured a HELOC of $435K against it from US Bank, secured a month ago. In the process i have also bought another ...

@Jonathan Boyd - I wouldn’t get concerned.

Where as with a 5+ unit they will be more concerned with the performance of the property and if it cash flows. 

If I were you, I'd absolutely take the loan, and just plan not to pre-pay it, and not do anything else to cause extra fees!