One of the wholesaler's in my area has a strategy of getting cell phone numbers and she will mass text potential buyers with a small ad with basic details (Asking Price, rehab cost, and possible rental income) and ask those buyers to contact her for a more detailed listing.  

Then you can read it on any of your devices or your desktop browser.

Our excel sheet has a cell for the Sellers Contributions and your solution of substracting it from the down payment makes total sense. 

I will drop you a PM with my cell number and email (if I post it here, the spammers will find it!).

If you're not already doing so, I would recommend the use of stop-hammer devices.

 :)  I am going to add a few smart devices to one of the two and leave the other as a normal build.  

But don't get too excited, because deductions of normal expenses like cell phone and home office deductions are hard to justify with only one property. 

-Willing to give me their cell phone number.

Most times it was due to a recent device (outlet / light fixture) change and a connection wasn't tightened good enough that came loose over time, or a device failure.

If you have space, you rent out office space for meeting, have mailbox services, rent land to cell towers, etc.. if you have right of ways or easements that you can't build on, you can place portable units or have parking for boats/RV/vehicles.