Lots of "tough love" on this board, I see that as a good thing. It's not a "mainstream" board, you can get info and advice that isn't common in the finance world. That's why I've been lurking here for over 5 years.
The key here is for you to take a good look at your real estate bias...
You totally blew off the post that put your net worth at 70k. And the one that said you are over-heavy real estate. You also commented it's our only debt....we don't owe on other things...if you had any more debt, you net worth would go negative.
Also, I am wondering about the 140+ you have in 2nds, was this to avoid PMI and make a low down payment? Or was some of it used to "pay cash" for your empty lot? Another sign of being top heavy in real estate.
Also, your use of the terms "fire sale" and depressed markets and rental income, along with the idea of building on the empty lot, lead me to believe you are in denial about the true state of the real estate market. Fire sale is market price...
BTW, don't shoot the messengers because you aren't happy about what they are telling you. You won't hear any advice like this from bankers, or real estate people, or builders.
As to what you should do, your call of course, just be aware of the messages you are getting from people here, I don't think they answer posts to make fun of you or mock you. I have found this board to be a mix of pretty neat people