My late wife and I held joint interests in a piece of real estate in our separate individual self directed 401k accounts.

This likely reflects reduced demand for T-Bills, heightened inflation expectations, and increased Treasury supply, all contributing to higher mortgage rates and a tougher environment for buyers.There’s likely more at play here, but I agree it’d be great to see mortgage rates head in the other direction sooner rather than later.

I have found several vacant lots in my local area that I am interested in.  I have the information I need to send letters to the owners of said lots.  My problem is that I am unsure of what to write. Do I send a one p...

If you let us know more about what you're trying to accomplish I may be able to point you in the right direction.

A few years ago I got caught with a number of housing units I built in Philadelphia I planned to sell to owner occupants if not for the  2022 unexpected rate increases.

This deal came through a direct seller lead, which we negotiated quickly and efficiently.

Real estate is often full of unexpected and expensive potholes and you don't really sound geared up for that.. 

It might not be 100% accurate but it'll at least give you some directional data to use. 

Or is it better to go directly to the city to get the permit process?

You quoted Vivian, aka directly responded to her.