S-Corp vs. LLC tax question

Ok, all the information I'm finding is conflicting, so maybe someone here can help? I am buying commercial real estate with a salon/spa on the second floor of the building. I plan to run the salon myself, and will pull a very small salary while doing so. I want to structure the salon as one company, and a separate company to manage the building and lease the commercial space downstairs. I'm down to either S-corp or LLC, but understand LLC may choose to file taxes as S-corp. Can't find any info as to whether that can change on an annual basis, or must file as S-corp for certain period of time. The issue is this: we are starting with little working capital. The salon will pay rent to the management company, but cash flow is coming from salon in beginning, so funds may need to transfer for build-outs/repairs/etc. during the first year. Also, any profits outside of the salary I will pull from the salon will be reinvested. Can anyone suggest best structure for salon and management company to reduce tax rates based on this info?