Is it worth exploring these vacant properties in Japan?

Absolutely.With this mindset, you move past sitting on the sidelines out of fear—which is probably why you're asking in the first place.As someone who used to think the same way, I’d say face the fear, take the risk, and buy the property.

Primary you can go as high as 90% CLTV and investment 80% Max LTV but with most DSCR or lenders 75% MAX investment.Best way to map this out or to make sure your taking the right steps with the right property is to have a long conversation with a Seasoned Banker and your realtor. 

Start by crafting a clear and compelling investment proposal that highlights the property's potential, your investment strategy, and projected returns.

My other properties cash flow +$500 a month.

I'm particularly passionate about properties in Southern New Hampshire and the North Shore. 

I would check out Hospitable for property management software that does a lot at a reasonable price!

Otherwise, is too hard to know for sure how much a property might cost to prepare for a STR.

Our focus has been on creating high-quality, cash-flowing properties designed for investors looking for solid returns.While we primarily concentrate on vertical development, we’ve also started exploring horizontal development in certain projects as we continue to expand our footprint.

@Isaac Lane Try to find a good contractor that can walk the properties for you to give you an estimate of what the cost will be to rehab/renovate everything.