Tax (and often even zoning) designation don't change the comps for what it physically exists as.Is a residential appraiser telling you this, or are you basing this assessment only on your own understanding of these classifications? 

They have a whole marketplace.

Assess if you have enough time for tasks like tenant screening and maintenance.Expertise: Professional managers know landlord-tenant laws and property maintenance best practices.Cost vs. benefit: Weigh management fees against potential savings and efficiencies professionals might offer.Property location: Distance from your home to the property matters.Number of units: More properties increase management complexity.Stress tolerance: Consider your comfort level with tenant interactions and problem-solving.Long-term goals: Professional management can free you to focus on expanding your real estate portfolio.

An LED lights up the room so much better and does not get dusty.No, the house does not have central air, but this is Ohio so A/C window units are commonly used for the couple months of the year they are needed.I just picked up 4 matching ceiling fans for $25 a fan on Facebook Marketplace. 

Is the house value assessed by Zillow based on as-is condition?

Some post here on the Bigger Pockets Marketplace.

I need to figure out a base operating cost so I can consider this when I assess land purchase price, but I"m finding it very difficult to asses things like insurance, property tax, utilities etc. on something that isn't build yet.

MODERATOR: Its OK to assess interest in this forum, but any actual meeting notices must be posted only in the Real Estate Events and Happenings forum.

Is her assessment correct?

with maybe the exception of a parcel that is clearly served by city Sewer Water and have power and Tele / internet to the lot lines.. and you have double checked the hook up or Systems development charges and if they have capacity.. keep in mind many parcels in subdivisions that were basically built as recreational subdivisions decades ago.. ( think GLEN GARY GLEN ROSS and for sure watch that Movie is exactly how the industry was in those days) the original infrastructure was allowed to be built to maybe serve 20% of the development that was legal and now you have moratoriums and assessments etc etc..