为一段给定的文本寻找同义词替换。
"对于被认为是两级制度的公司和租户而言，此体系为重要的同时成本问题。"
"For companies and tenants who are considered to be operating under a two-tier system, this structure is important but also poses cost issues."

Possible synonym replacements:
- 两级制度 (two-tier system) -> 双层结构 (dual-layered structure)
- 公司 (companies) -> 企业 (Enterprises)
- 租户 (tenants) -> 承租人 (lessees)
- 体系 (structure) -> 构架 (framework)
- 重要 (important) -> 关键 (crucial)
- 成本 (cost) -> 费用 (expense)