The agent’s vague reference to waiving “it” is the detail that would make me pause before settling on the offer terms. If it means a minor timing condition, that is one discussion; if it means inspection, finance or appraisal protection, the risk is completely different.
Ask the agent to...
Raising the rent from HK$20,060 toward the HK$22,590 asking level risks losing a reliable tenant; leaving it unchanged means accepting a widening gap. Neither option feels comfortable once vacancy, refurbishment and reletting are priced in.
A smaller adjustment may be the sensible middle...