My businesses were forced to close for an extended period of time in 2020 so my tax returns look completely different from 2019 to 2020.

Period. 

We shred old tax documents and receipts as they have reached their holding period of 3 - 7 years.

Apparently most carriers will do this if you have two claims within a five-year period. 

The initiative, subject to a public comment period, would seek to make nationwide current reporting requirements on transactions in 12 metropolitan areas with residential property selling for more than $300,000, officials said.

Period.

You also get your payback period...6.6 years in this case.

Typically, a developer needs to do the early stage work and run numbers based on preliminary data to figure out two things: The 1st is define what the Planned Project is all about (Highest & Best Use, Density, Finish Levels, Cost, Income, Expenses, Capital Stack (Debt & Equity), Partnership Structure with an Investor, Holding Period and so on.The 2nd is for the Developer to figure out the deal structure with the Landowner; If a purchase, settling on a fair due diligence period that will allow the developer to close at the time the Project is “shovel ready”, the milestones associated with the permitting process and the earnest money released to the Seller as the deal progresses.

If you are over for a bill period it's likely minimal and then tenant can probably absorb that amount in the monthly payment.

You will only get to prorate the gain between periods of qualified use (as your primary) and non-qualified use (as investment).3.