Search captures the requirement; LinkedIn reaches the person who signs
Running a brokerage account on search alone caps your reach at the small share of the market that happens to be typing this week.
Google gets you the active requirement. Someone typing "warehouse for lease Palm Beach County 10000 sq ft" is in market now and worth a premium bid.
LinkedIn gets you the appointment. Facilities directors, CFOs at growing local employers, private owners of two or three assets, family office principals: they can be targeted by title, company size, industry and geography whether or not they are searching.
The two campaigns should carry different messages. Search answers a stated need with availability. Professional network ads carry a point of view, a market note, or a specific piece of expertise, because interrupting someone requires giving them something.
Budget split depends on your pipeline. A firm that needs listings weights the network side; a firm sitting on unleased inventory weights search.