1. Insurance - the cost to rebuild
2. Collateral - the value against a loan - conservative
3. Fair Market Value - what a willing and able buyer would pay
4. Appraised value - Highest and best use for the property. More involved, can vary from the others.
If you have more questions re-post. The REASON you want the valuation will help determine the value.
The most accurate information would be available from the assessors office in RO.
I'm assuming this is for tax purposes. You can also contact a local tax professional and they might be able to give you a generalization. In the 90's the range used was generally 25 to 33 percent for platted subs and up to 50 percent or lake property. This value has certainly changed by now and might not be accurate. Please remember the value of land does not decrease.
One of the ways to do it is to find out by your tax records at the local tax records office and make the necessary adjustments to know the current value. The other way is for you to contact your Realtor and ask him to research it for you. Some Realtors have connection with appraisers and they can let you know the ball park figure of the land itself.
Hope this helps.
I don't fully understand your question but you can go to the city's website - http://www.ci.royal-oak.mi.us - and click on Assessor's Office. From there you could do a tax lookup. Are you looking for the value of just your land without a house? If you have a copy of a recent appraisal of your home, on the second page, on the top left, the appraiser would have given a value to the land there. Otherwise, you can have an agent prepare a comparative market analysis for vacant land in your area. Please feel free to contact me directly for more specific information. Take care!