While I have to admit that the power of eminent domain is a necessary evil, it is one that should be exercised with extreme reservation. It should only be used for critical infrastructure needs and similar. It should never be used to promote economic development -- that is a private sector responsibility and if the private sector wants a piece of property to move a project forward, then they can either come to terms with the property owner or move their project elsewhere.They also use the court system. re: Eminent domain taking in New London for potential economic development. Over a decade later, the land is still undeveloped.
One way to do this would be to acknowledge that paying property owner "fair market value" for property seized under eminent domain is completely inappropriate -- the fair market value is based on the premise of a willing buyer and a willing seller. If the seller is not willing, then the price goes up. This could be handled automatically by first determining the fair market value and then increasing it by some fraction for every year that the current owner has owned it. The goal there is to prevent people from profiting by buying up land in an area where they believe (possibly due to insider information) that imminent domain is going to be exercised, while also acknowledging that long-time owners should have stronger property rights -- the family farm that has been in the family for generations should cost a LOT more than the land bought on speculation a few years ago by an investor.
One way to balance this might be to only pay fair market value to land owned fewer than three years. Beyond that, the price goes up 10% for each year owned up to a maximum of five times fair market value. The numbers, of course, can be tweaked, but I think a scale like this would discourage governments from exercising eminent domain too capriciously for other than critical projects and would encourage them to negotiate with property owners in the vicinity to find willing buyers at prices above the normal fair market but below the costs of exercising eminent domain.