Though I have not purchased my own real estate in NJ so I might be unqualified to speak about it; I would say attend Brandon Turner's webinar which he typically holds every week on this very topic! 

Typically appraisers will appraise at or just above contract price when it is worth more.

Typically if you have a good deal, it's easy to find an end cash buyer.

I typically start a new lease as a 12-month lease and then it converts to month-to-month after that. 

What are your typical margins of profit?

Typical new build will have primarily 3 segments for value creation 1.

Since I may have to do them anyway for the next person, I'm OK with doing anything a landlord should typically do.

There are typically no contingencies that I am aware of in a land contractCan you provide an example ?

I typically suggest my clients engage a land development specialist to assist with this process. 

Property tax websites are unreliable, as they are typically only updated around the time tax bills are sent out, which is only once a year in my county.