I am a long-term investor with a buy and hold property in Brooklyn, NY and I also own multiple lands in Florida and Mississippi.

A broker will be able to help you determine the value of the land. 

Granted this was on plots of land I didn't pay for, and that are already connected to the city's water and sewer, so there's a lot of savings there, but I'm hoping if it turns out to be this good of a deal I can still scoop up land and keep going

Answer sure.. have to check if there is a due on sale clause or if you have a PG to the orignal seller.. that mortgage stays in your name unless there is a formal assumption  Maybe the example is more challenging for a house as the property.Ex. with vacant land - seller finances to me $20k with 5% down and $1k/moCan I after 1-2 months, then resell the land to a cash buyer for $25k, pay off the original $20k and pocket the $5k?

how much land and how much money do you have?

One developer I worked with built smaller homes around a central courtyard, and buyers appreciated the balance of affordability and community.In San Diego, where I’m based, density has taken a different shape...like ADUs (Accessory Dwelling Units) that maximize land value.

But I purchased land in cash and leveraged it to build a new construction stick built home.

I was raised in the land business and sold land exclusively for many years.

Number one, do you have a comp from another land lease property.

That might be a way to start, finding recently sold land on zillow, back trace agents to sold listings and tell them you might have some land coming up soon and see if they have buyers.