Who should I call first about a vacant lot?

For a buildable lot search, would you start with a land-focused broker or a general residential agent? A land specialist may be more familiar with access, zoning, and site constraints, while a residential agent might know more of the local listings and neighborhood context.

I’d want to ask either one how they find vacant-land listings and off-market leads, and what they can actually verify about zoning, utilities, access, and basic buildability. I wouldn’t treat an agent’s screening as a substitute for independent review of whether a parcel will support a particular house. What expertise or referrals would you look for before relying on either agent?