@V Reddy
First, setting up an LLC to invest in real estate is generally to limit personal liability and for asset protection (select "magnifying glass icon" in top-right corner and search "LLC", you'll get a lot of feedback). In the case of a syndicate, the LLC and its operating agreement help to formalize the legal relationship between investors. Do each of the individuals investing in the syndicate need their own LLC? It depends on the syndicate and your personal preference.
You don't need an LLC to write-off legit business-related real estate expenses.
Based on what you said, I'm going to assume that you aren't the person responsible for coordinating and filing the taxes for the syndicate. This also includes making sure the K-1s are distributed to investors. - let me know if I misread this. The syndicated LLC tax returns should not be filed on TurboTax.
Yes, you need a CPA/EA to understand your responsibilities as a GP of a syndicate and also the tax optimization strategies that may be available to you, or not available in the case where you are an LP.
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*This post does not create a EA-client relationship. The information contained in this post is not to be relied upon. Readers are advised to seek professional advice.