You'll need more capital and most will require a personal guarantee and personal financial backing. 

What % is typically required these days? 

Just make sure you set up a LLC to rack up the required experience.

I wouldn’t worry about the higher dp because any investment property is going to require 20% down , like a DSCR  Let me know how that turns out!

Reason is a Heloc generally carries a higher rate on a shorter term and "Can Never" be used as an "Asset, or for PITI reserves" which are both required when you buy an investment property. 

OP, keep in mind not having access to heating and sharing same water heater and etc will require an easygoing tenant in the nextgen.

3️⃣ Local Regulations: Before you invest in a short-term rental, it's essential to understand the local rules and licensing requirements.

It likely would require something grossly negligent with huge consequences to have a chance to go beyond my coverage and we are not that negligent. 

I wouldn't be surprised if Boston required this type of "remote eco-mitigation." best regards,Chris

and it would require in terms of investment and resources?