Even the 4 units will be capped for prices increases . so how do i increase the value of the property if the remaining 4 also decide to stay long term .

Realize this is kicking the can down the road; the basis of the purchased property goes down (and you get the associated depreciation), but when you sell that property,  the amount garnered will mostly be cap gain that you will need to pay tax on  -- or remain on the merry-go-round and buy another. 

The partner's equity would remain in the property preventing the need for a down payment?

Now, when dealing with problems I remain calm and keep a level head.

Lubbock is a more stable market than Mildand/Odessa and will likely remain so.Rent Cafe for Lubbock (average rent):May 2016 — $928May 2017 — $915May 2018 — $910April 2019 — $907There have been some bounces both lower & higher in some months, but this has been the trend line. 

Put that remaining 5K in your pocket as profit.Now you make 2 deals, because you eliminated all the bottlenecks, and you tweaked the method as you learned from the first time.

What are the beat ways to finance remaining 300k ?

I know that publishing articles and creating niche sites is a little different than trying to rank a business site, because you can't just move on and choose a different niche if it's your business, but the question remains the same...

And if so, does the remaining tenant meet your criteria for the unit?

If your 1st lien mortgage is 75% LTV, you could ask the seller to carry the remaining portion...