So the LLC will need to sell the assets and 1031 into another instrument which can be compatible with 1031 but be completely passive and allow them to generate income on the deferred tax and deferred depreciation recapture for the remainder of their lives.

In July of 2017, I started using realtor.com for leads.  

Also, Brookland Park Boulevard is undergoing a transformation near Chamberlayne Avenue that may help Highland Park as well.Still, I don't like to bank on appreciation with real estate investments and I don't think that the housing stock in Highland Park will lead to the high end renovations going on in surrounding neighborhoods.

Then I went to a few construction forums and found out that it is a pay per lead system for them.

Hello my name is Aubrey and I am a new agent, so I have little experience but I am familiar with coordinating transactions, calculating numbers, marketing, and lead generation.

Also be conscious of where the ad leads them beyond their click.

It sounds like you are very bullish on the future value of the land, in which case I would just wait it out to see if the equity split improves or tell the lead builder you are considering other offers with better terms.

Don't get caught in the trap of not wanting to hurt your cash flow, when that equity could be better utilized to generate more cash flow in a safely leveraged additional investment with all the other associated benefits of owning more property(loan pay down, depreciation, chance for appreciation, etc.).

Maybe I should take a couple of properties and do that to start with to generate some more income. 

I've bought a couple deals from wholesalers, and it works out, but when I see the assignment fee that I'm paying, it just makes sense that I should go out and find my own deals--I'll have way more equity and my portfolio will be way healthier in terms of profitability and equity.There's a lot that goes into finding one's own deals--marketing for the leads, following up with the leads, getting them under contract.