@Marshall Hooper Doesn't change my statement.

But even with no direct upfront cost of land, the cost to build doesn't seem to be worth it.  

The realtor really doesn't do much.

And if it doesn't fit find a different aspect you didn't know and try that.

He is a bit tired of working on this lot and said that he would be willing to let me take on the project (I would have to get the financing and manage it, he doesn't want to get the financing)  and we could then share the profits of the flip.

The problem is getting to a point that he doesn't like to have workers inside the house.

Even if you get the property you will now pay taxes on the gain as it doesn't get "stepped up" as it would be in a will.I believe your stepdad owns the home outright and you really have no rights to it, but hopefully a lawyer will tell you differently

Here are the key data points:Park info  Located in Alabama61 lots25 owner occupied homes18 park owned homes (14 currently rented; 4 currently being repaired and should be rented soon)18 vacant lotsAvg lot rent - $160 (unknown what the market rate is but it doesn't sound like there has been a rent increase in at least a year, maybe more)Avg POH rent - $400Expense ratio - seller claims 26% but I'm estimating 35% for the lots and 50% for the POH'sCity water - individually meteredSeptic - good condition (allegedly); a couple were pumped last year, none this year (no lagoon thank heavens)Seller claims gross income $130k, expenses $30k, and NOI $100kI calculated gross income of ~$135k, expenses of $60k (55% on POH and 35% on lot rentals), and NOI of $75kOther infoMom & pop seller, but park is listed with a brokerPark has been on the market for > 3 years (recent price reduction)Greater metro area stats look goodPopulation = 115kMedian home price = $105kUnemployment < 8%Household income > $40kHousing vacancy ~ 15%Closest Walmart is 7 miles awayFreeway is 1.5 miles awayNumbersMy valuation is coming out about $80k-$100k under the seller's asking priceWith conventional financing I'd be hoping for a purchase price of $500k, $100k down @ 6% over 20 years (not sure if this is plausible or not)Assuming that financing, I'm expecting net cash flow of $40k (after debt service)Upside potential is in raising rent and filling the 18 vacant lotsFollowing the same assumptions above, raising rent $50 (if the market supports it) would change NOI to ~$90k and net cash flow of just over $50kFilling the vacant lots could potentially increase gross rent up to somewhere between $150k-$200k, depending on what the appropriate occupancy rate is for the areaWithout verifying any of the above information (haven't offered anything yet so there's a lot of DD left to do), the deal seems to make sense. 

My tenant doesn't want to leave, but I have transitioned her to a month-to-month lease. 

I assume if you're using him and liked him when you worked on buy side it would be the same (unless he just doesn't think he's making enough money off it and it's not worth any work).