There is no set ratio of land to building - at least not in BR as far as assessments go. The assessors office divides the town into about 200 distinct neighborhoods...an acre in one place might be valued for tax purposes very differently than an acre across town.
I have found that the people in the assessors office are very easy to talk to and open with information. Your best bet would be to call them directly.
Hi Keith, I'd be happy to talk with you about the Basking Ridge market - I know it well. Basking Ridge is a strong market and signs are good for a solid Spring.
Basking Ridge has been and remains in high demand. The biggest issue has been a shortage of inventory which began in 2013. Though demand was down statewide starting September, I think part of it was buyer exhaustion and frustration with lack of new offerings. With new inventory coming on, the market is excited and nice listings that are properly priced are moving.
Here is a screen shot of the December market summary for Basking Ridge - you'll see a market absorption rate in of 2.4 months - which is very low and solidly in the "seller market" zone.... more
All home sales ae public records. You can use the following link to look up any Land Records & Deeds in NJ by county or zip. Unfortunately, agent information is not available. Another source is a Local Weekly Newspaper as I see others have suggested.