I understand the rate is competitive on the assumable, but having $300k liquid, you might as well do a lower downpayment and Buy down the rate. 

A lot of people under-estimate how much work is involved with owning real estate, especially if you go the route of self-managing.

as i stated in a previous post, if you want immediate growth, you're best off in a savings account.Half of the reason is because I understand property value and profitability and not settling for less.

I am like understand 70% of it.

What financing options are available when partnering with a solo 401(k)? Can you use conventional loans, or does the loan need to be non-recourse?

I think these type of properties do cash flow well from my understanding. 

These programs very commonly involve restrictions and conditions on use, refinance, or resale of the property. 

For your question, as far as I understand, the city of Binghamton doesn't allow STRs, but a lot of people do them anyway.

However, I also understand that lower housing cost may saturate the rental market. 

Not saying that those are possibilities but understanding those potential outcome and doing what you can on the front end (screening + clear expectations) to avoid them.