Just depends on your current rate, strategy, future cash-flow, etc. 

Depending on the lender and program your biggest hurdles might be credit score and income and time in job. 

For a nice possibly furnished STR, you are looking at between $250,000 to $350,000 depending on your budget. 

Depending on market, I would plan to invest 100k in a single family home, find a good property manager, realtor, attorney in compelling market and just start. 

Some of my clients love the cash flow in the east side neighborhoods over by Slavic Village and Broadway selling between 90-110k with rents up to $1,800+, but just really depends on the types of neighborhoods you're investing in and your risk / reward threshold. 

I have heard that interest rates for a DSCR loan are generally 1-2% higher than conventional loans depending on the LTV ratio and credit score.

It depends on what your interest rates are.

And even if the due on sale wasn't enforced you would be dependent on them making payments to the bank.

Depending on how upscale your finishes really were, you could have that built in this market for 300 to 325 per square foot fairly easily right now.

How much detail are you wanting:In Renovations, this can be anywhere from $30k to $500k, depending on properties needs, scope of work, scale of finishes, access to labor, etc.