Excel can easily do all this.You can likely download a free template that already has all the formulas you need.

I'd prefer free options. 

I dont have the knowledge necessary to navigate the historic ordinances and rules there, so I've never done what youre about to do.  

So in year 6, that same 95k initial investment they made is going to allow them to gain 24k net rental income (and the depreciation is still enough to cover that so it would be TAX FREE), 51k, in appreciation, 11,500 principal paydown = roughly 86k in total return in year 6.So a 95k investment after 6 years would give them an asset that they'd have 539k in equity. 

However if he refuses to pay anything for terminating the lease, I am unsure it is even worth the time to consult with a free tenant legal advisor.  

I am a local investor and contractor here in jacksonville, feel free to reach out if I can help with anything or answer any questions. 

Feel free to reach out if you want more insights. 

The purchaser may have to present that claim in case the executor does not have actual knowledge of the contract, but you are mistaken about unenforceability. 

If you want a copy of this spreadsheet to track your REPS hours, feel free to send me a DM to get a copy.

Seller financing, they don’t want to pay taxes, if you live in the area use the 2 out of 5 year tax free gains as primary residence later, don’t rent or lease for housing- rent storage space where they can live.