@Kamal Sukhija, The single member LLC option as been mentioned a couple of times. 

However, SEP IRA contributions require earned income from active participation in a business or trade.Our goal with posts like these are to increase awareness of all the options that may be available to them, like this one.

I have purchased one duplex using my own money and am looking to scale but wanting to leverage OPM or low or zero downpayment funding options. 

Be sure to explore all around the forums as well as many of the FREE tools that Bigger Pockets provides.I am on the lending side of things and am always happy to hop on a call to discuss loan options that are out there, even if not offered by my resources.

I would recommend working with a TK provider that has options for you to diversify in multiple geographical locations. 

If you haven't already, let me know if you want to look at any cash-out refi options for your short-term rental.

If you have the ability to pay cash for the flooring it would be the cheapest option.

Also would like to know of any local credit unions with portfolio lending options.

Also, I am considering alternative financing options (beyond Hard Money).

You’ll need to submit an application to the Community Development Department, undergo inspections, and comply with tenant notification and eviction rules, including providing a 90-day purchase option and relocation assistance.