Last year, I purchased a SFH under market at 7.65% interest rate and did some rehab to up the value.

Was that purchase money, rate and term refi, or cash out refi?

Purchase price: $275,000 Cash invested: $129,000 20-unit hotel, was abandoned and had sat on the market for 3 years.

It could be possible to still negotiate a purchase depending on the stage of foreclosure it is in. 

Our plan is to purchase again with a better mindset of turning that into a profitable rental.We have diligently completed all the necessary steps and are on the verge of signing a management agreement with a property manager.However, we are experiencing some doubts.  1.

In 1-2 years you could save enough to purchase a home to house hack.

They sell a 4 unit for close to 1 million dollars close to Jacksonville. they want 250k or 300k down. there's no upside. you can google the properties on biggerpockets and there isn't a lot of satisfaction. it's a slow return and get rich slow strategy. our focus is always as a builder to add maximum value, lower cost as low as possible, build and rent and build and sell the same product and raise prices to help investors out. we have a large market share and large purchasing power in our market in columbus ohio. the one strategy I never liked about turnkey new build brokerage companies like them and build2rent or others is they don't really build close to urban centers and most are single family homes. the numbers don't work on single family homes. if single family was the way to go more companies would be doing it. but by far the most common type of new construction built is three story walk up apartments.

All of which, I’ve purchased within the last 4 years.

If so they may have a real estate license or they may work with an agent that relies on repeat business rather than a one-off purchase. 

The primary thing you're going to run into is whether or not a lender, at purchase of the property, will allow there to be a secondary lien on the property.