We would have to tweak it a bit for your exact situation but I think it would be best fit. 

You'll need to tweak your input. 

That step might need tweaking.

I'm looking at the standard lease agreement I have used for years and wondering if I should be tweaking it based on recent events with COVID. 

Some numbers here might help a bit, like payment you're trying to cover and amount you're asking for a room.For example, you may be asking just a little bit too much for a room or it could just be a minor tweak in marketing that is needed. 

It was recently acquired by apartments.com, so I am sure there will be a few tweaks in the future.

You likely won't find a pre existing contract that will be perfect, but if you find a few different examples, you can tweak it to your needs.

If it does run longer term, those using models based on the traditional income data will need to tweak their methods.  

and then how would we tweak that model during covid times?

Though you'll get more flexibility with a spreadsheet where you can tweak data inputs.