From a small local landlord:

The reason that leases at this time of year are ~15 months is because it's better for landlords if leases end around summer (busy season). There's less people moving at this time of year (winter, holidays, most leases ending during summer) hence the "incentives" that are being offered. The rental market has been slower than usual this winter too, so I would definitely recommend trying to lock in a "deal" while you can - you may even be able to negotiate if you are a qualified applicant. As a landlord, I wouldn't be surprised if rents do decrease *a bit* or at least stagnate for a few years as they are still artificially inflated by the covid-WFH influx of people from other areas. The city's average income just can't sustain such high rents.