I've never understood 5% annual increases in rent. 

I hold a real estate broker's license, but I'm currently not active as I'm seeking a brokerage that is investor-friendly.

However, rents keep increasing and, assuming you get fixed rate loan, your p&i is fixed.  

Most experienced people doing subto are also not going to be in these deals for very long, they will only hold them for a short time period because the risk increases the longer you hold the property.

I know investors who bought an apartment building OOS and lost money, having to evict a tenant who then damages your property, steals the appliances and water heater then seeking legal action against the tenant and negligent property manager while 2000 miles away.   

What are some thoughts on putting say 30% down to increase cash flow a little bit and pay less interest over the life of the loan ?

This year, experts have noticed that the real estate market has been witnessing an increase in foreclosure activities across the country, including a remarkable shift in commercial foreclosures.

I am seeking investors/partners who have the capital to invest in me where it will be a win-win situation.

With that we can eliminate our utility costs which increases our bottom line and adds value to the building.

Readers should seek professional advice.