I would not try to close the whole gap at once. First confirm that $4,260 reflects completed leases for genuinely comparable properties, not optimistic listings. Then compare the extra rent with vacancy, preparation and reletting costs. Also check which local notice and rent-increase rules apply...
On mobile, I’d prioritise only a few filters at first: location, retail use, price and floor area. Over-filtering is risky when the underlying fields are inconsistent. Run a broader search occasionally, because a suitable unit with an omitted area field could otherwise disappear from the results.
The parking difference is the detail that makes me wary of putting too much weight on the lone sale. A completed transaction is usually stronger evidence than an active listing, but it can still be a poor guide if it had inferior parking, unusual seller motivation or very different outdoor...
Before settling on 5%, compare the likely cost of essential work with optional updating. Roof, structure or services may affect what you can safely pay; paint and finishes are preferences. Inspection should help distinguish them, but your initial budget should already leave some room for...