If it were me, trying to build up cash flow, then I would refi the duplex and use that money as a down-payment on another property to BRRRR and repeat the process.

Let me repeat this...Cash buyers need YOU.... as long as you provide value.

Repeat every year until their rents match the markets.If the tenants wish to move you may also need to pay relocation assistance as well depending on the situation, up to 3 months' worth of their current rent.

Keep it for a year and then rent your renovated side out for the $650 when you move out to repeat the process! 

Next I would look what was the issue with this deal was it overpaid for the deal, underestimated constructions or what as not to repeat this.

I've seen you've done some selling, listing, or whole-selling in the past based on your listings here.I'm always looking to help someone out or share knowledge but am just trying to figure out why this pattern seems to be repeating itself.I'm not judging you, because we all go through our own battles,  but your posts seem very vague in general about the current situation. 

My ultimate plan is to sell my lot to a developer who will likely construct a multi-unit- the lot is approximately 10k square feet and zoned for multi-units.The benefit is that they are paying the cost to build a new wall between the two properties, as there is no wall there currently.However, my concerns are (1) will this affect the future value of my lot- as the v-ditch encroaches onto my property approximately 12 inches, effectively reducing the useable square-footage of the property?

If so, can I transfer it to a LLC in the near future and how would that affect my interest rate or loan structure. 2.)

You can then repeat that Process.

Please fill me in on what to expert IRT my asking price and if there are any items I should be aware of come inspection day that will affect my rental rates.