Marisa: Existing zoning regulations must be loosened; in some places the restrictions on development are now so prohibitive as to reduce the property values of undeveloped areas significantly.
Marisa's Conclusion
Zoning regulations must be loosened
Marisa's Evidence
In some places, the restrictions on development are so prohibitive that it's significantly reducing the property values of undeveloped areas.
Tyne's Conclusion
Zoning regulations don't need to be loosened.
Tyne's Evidence
The value of natural, undisturbed areas can only be better preserved by such regulatory protection.
Evaluate
What part of Tyne's response seemed weird or off-topic? To me it was the "natural, undisturbed" areas.
It sounds like Tyne is talking about regulations that prohibit developing in a wilderness refuge, or on endangered wetlands, or something like that.
Marisa seemed to just be saying, "you know that empty plot of land southwest of the Wal-Mart? It should have a pretty high property value, but because the zoning regulations are so strict, developers can't really build what they want or how they want there, and thus the value of that land is plummeting.
Goal
I would go looking for an answer that speaks to the difference between "undeveloped areas" (an empty lot that developers would like to put apartment buildings on but can't because of zoning regulations) and "natural, undisturbed areas" (precious parts of the natural ecosystem that we don't want to touch".