The road obligation is a method, not a number
Offsite road work gets carried as one line in the budget. Jurisdictions arrive at road obligations three different ways, and the three produce very different exposure.
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The pump station is a permission, not a purchase
No adjacent gravity sewer reads like a number. On many sites it is a permission, and the town does not have to give it to you.
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What a dedication actually costs
A right of way dedication arrives as land, not money, which is why it gets underwritten as free. It does not cost money. It costs depth.