Lots of ways to improve the situation.   

Also client is not responding to phone calls/emails.In the mean time, what else can I do to remedy the situation?

The kind that can’t fill out a form, checks both boxes in an either or situation, and can’t be bothered to respond to calls, texts, or emails.

I'm saying you invest with appreciation on my mind, and make sure you're situating it to remain cash flow neutral to positive via other mechanism.

@Heidi FischerGreat questions for a CPA that knows more details of your specific situation. 

I completely agree with the advice and I'm perfectly okay with not charging him rent.My concern is that by treating this property differently from all the other units in the Series LLC, I may be opening myself up to a situation where I'm weakening my LLC protections even if I keep the financials separate and in order.

They typically charge 1% of the financed amount but should be able to find a lender to suit your needs and hopefully avoid situations where financing falls through at the last minute.

Would love to have a chat about your specific situation to see if I can help be of service to you or point you in the right direction!

If they decide to move out you can do the remodel. 3) are the tenants in any kind of financial situation to buy the property?

I have a similar situation right now on a deal i have pending.