The interagency thresholds for requiring an appraisal was recently adjusted. Generally, the appraisal threshold was set at $250,000 meaning any loan at or below that limit could use an evaluation of the property rather than an appraisal. A final rule issued on April 9 of this year changed that threshold for commercial real estate loans to $500,000 meaning loans at that threshold and below are not required to have an appraisal and may rely on an evaluation. If transaction is exempt from the requirement to obtain an appraisal because it meets the threshold you must still obtain an evaluation of the property.
There are instances when you may rely on an existing appraisal or evaluation. However, considering this appraisal is four years old I would be hesitant to do that. Here are links to resources you might want to review:
2010 Interagency Appraisal Guidelines here: https://www.fdic.gov/regulations/laws/rules/5000-4800.html
Interagency Advisory on Use of Valuations: https://www.federalreserve.gov/supervisionreg/srletters/sr1605a1.pdf
2018 Amendment to Threshold for Commercial Loans: https://www.fdic.gov/news/board/2018/2018-03-20-notice-sum-c-fr.pdf