Annual taxes so high on EP property

[Ion]

I am looking for acreage. On MLS listings, I found some property which are under Provincial or Local Conservation Authority. I know the tax rate classifications and zoning. It is fishy a property tax of $1700 or 2000 for acreage Environmentally Protected (EP) land with nothing build or 6 acres residential land on small village.
The real estate agents avoided to give an answer and provide the Roll #.
Q. Why the annual taxes are so high ?

Cases:
1. Real estate said the land is 74 acres with street address, tax $1700,  nothing build, wetland protected by Provincial Authority and a hand drawing of land shape.
I figured out the street address is covering 70 acres and the neighbor address 4 acres EP with a home. There are two different Roll #. 
Q #1. Can the agent sell this?  He does not have a clue about the existence of home ? Or this owner pays the taxes for the neighbor property?

2. Listed on MLS:  5 acres of land,  pond,  trees at the back
I figured out that: the Roll #, land size 5 acres A1 with no trees. At the back of that land is the pond and trees which are other 5 acres part of 195 acres land with different Roll #.
Q2. Can the real estate sell something which is not served. Or specified 5 acres on deed and give you 10 acres?

[mountainman]

I am looking for acreage. On MLS listings, I found some property which are under Provincial or Local Conservation Authority. I know the tax rate classifications and zoning. It is fishy a property tax of $1700 or 2000 for acreage Environmentally Protected (EP) land with nothing build or 6 acres residential land on small village.
The real estate agents avoided to give an answer and provide the Roll #.
Q. Why the annual taxes are so high ?

Cases:
1. Real estate said the land is 74 acres with street address, tax $1700,  nothing build, wetland protected by Provincial Authority and a hand drawing of land shape.
I figured out the street address is covering 70 acres and the neighbor address 4 acres EP with a home. There are two different Roll #. 
Q #1. Can the agent sell this?  He does not have a clue about the existence of home ? Or this owner pays the taxes for the neighbor property?

2. Listed on MLS:  5 acres of land,  pond,  trees at the back
I figured out that: the Roll #, land size 5 acres A1 with no trees. At the back of that land is the pond and trees which are other 5 acres part of 195 acres land with different Roll #.
Q2. Can the real estate sell something which is not served. Or specified 5 acres on deed and give you 10 acres?

I am Mountainman.

Ion, you again?

I don't know where to begin.

For I am Mountainman.

[Dave2]

I am looking for acreage. On MLS listings, I found some property which are under Provincial or Local Conservation Authority. I know the tax rate classifications and zoning. It is fishy a property tax of $1700 or 2000 for acreage Environmentally Protected (EP) land with nothing build or 6 acres residential land on small village.
The real estate agents avoided to give an answer and provide the Roll #.
Q. Why the annual taxes are so high ?

Cases:
1. Real estate said the land is 74 acres with street address, tax $1700,  nothing build, wetland protected by Provincial Authority and a hand drawing of land shape.
I figured out the street address is covering 70 acres and the neighbor address 4 acres EP with a home. There are two different Roll #.  
Q #1. Can the agent sell this?  He does not have a clue about the existence of home ? Or this owner pays the taxes for the neighbor property?

2. Listed on MLS:  5 acres of land,  pond,  trees at the back
I figured out that: the Roll #, land size 5 acres A1 with no trees. At the back of that land is the pond and trees which are other 5 acres part of 195 acres land with different Roll #.
Q2. Can the real estate sell something which is not served. Or specified 5 acres on deed and give you 10 acres?  

The simple answer for tax sale property is no one probably has appealed them.  

On your other questions be careful.  Rural property descriptions are not always perfect.  Hard to really comment without a lot more data and research.  If you are going to try and claim more then you are entitled to I think you will probably need the services of a professional land surveyor to support it and for large acreages it is not cheap.  For your 70 acres $10,000 may be the surveying cost.

In one case I was involved in the research went back to 1820 to the original township survey and will probably take a court case to resolve.  The problem is the competing land owner family has been in the township for over 100 years and when in doubt they will probably prevail.