Vacancy time belongs in the business calculation, not in a rushed exception. A household ready immediately is not automatically safer than one needing a reasonable future date. Decide the acceptable move-in window before reviewing names, then compare the cost of waiting with the likely cost of...
For New York, I would ask how they account for differences within the same building and nearby buildings: condition, floor, layout, light, amenities and ongoing building costs. A list of superficially similar apartments is not enough. The report should explain why each comparison deserves weight.