My answer is, "there are none". 

If you have any other questions, I would be happy to answer them if I can!

best answer will come from your CPA @Chuck Dangar but I agree with @Linda Weygant  

The black and white answer is that you need 25% down to purchase on an investment property.  

If not, who do you think would have the clear and final answer to such question?

First, read what you wrote and see if the answer is right before your eyes.Option 2:  Maybe. 

I hope that's an accurate interpretation; here's my answer:1) Get to know values in your market, like the back of your hand. 

We were supposed to be partners with the purchase of the three family we were supposed to split the cost of closing and any expenses that came with buying the property the issue that we’re having now is that my father wants all the money that he spent on renovations of the second floor apartment plus wants 50% of whatever the house is worth all due to the tenants on the first floor that work for My mother.The tenant on the first floor Does not want to answer to any of my letters I sent out to the tenant.

If you need any help with properties in the Boston area, feel free to reach out and I am happy to answer any questions.

., but to specifically answer your question it is less expensive but riskier to go to 15 year mortgages as opposed to snow balling.