I have a great opportunity for lending since my restaurant is already well off and they would consider the businesses financials for the loan.

Once construction is completed and cash-out refinance complete I will pay off the seller I financed the land from.Is this feasible?

Personally, I feel you should start off with understanding what actual reality is.

Whenever I've done seller-financed deals, I've offered something a little more to the seller such as a higher down payment, higher interest rate, quick close, reduced contingencies etc. to sweeten the deal beyond a normal sale, and I've shown them proof of funds that I can pay off the property in cash, so that helps give them peace of mind that I'm a credit-worthy borrower.

Although I think you’re better off doing the job you have now.

You may also get lucky and be at 80% LTV to drop off the FHA MIP monthly insurance.

DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.

To them, the property is paid off, they aren't ambitious to grow, and they just want that mailbox money to enjoy retirement, so I say they are perfectly fine with a longer lease term. 

I have knowledge of markets throughout CT and have experience in a range of real estate strategies including BRRRS, flips, cash out refi, selling financing, sub 2 etc.I have access to off market properties, including some that need complete renovations. 

I can answer here since I think we are getting a bit off the rails.