1. The weather
The original article said the reasonable unpredictability of the weather between September and March tends to be the quieter season — quieter companies and potentially better prices. Warmer summer months are considered peak. Offseason moving can be the easier and more cost-effective way. See planning a winter move.
2. Lease costs
For a commercial or office move — something Liffey specialises in — consider price differentials in leases. The original article said companies are advised to look at signing a lease during autumn and spring, known for lower rental prices; office rent begins to hike in May, peaking in July. Commercial moving is the service page.
3. Availability
Rental activity always surges during summer. The original article said office spaces tend to open up more during July and a few months before or after, when rental prices are at their peak. Availability starts dipping through fall and tends to bottom out in December.
4. Pick the right day
In New York City, most lease contracts terminate at the end of the month. The last few days of each month and the first few of the new month are peak for office relocations. Moving mid-month will most likely give a chance to negotiate lower prices. Read reviews and get a quote.