In Fort Myers, where you live and I practice, social security is not included as part of any income calculation. However, the pension money is. The pension itself, though, is considered an exempt asset, if it qualifies under the appropriate tax statute. It sounds like you could probably file a Chapter 7, but your entire financial situation would have to be reviewed first.
Yes, it is possible that the landlord is attempting to catch up on missed mortgage payments. However, without him showing you proof of this, there is no other way I know for you to find out. If the bankruptcy was dismissed, then the bankruptcy has nothing to do with the mortgage anymore.
If you are on the lease personally, or if you signed a personal guarantee, then the landlord could sue you personally as well as the LLC. Usually, a landlord will have you sign a personal guarantee as part of the lease, and usually, you will be responsible for the balance of the term. However, the landlord usually has a duty to try to re-rent it, to lessen his damages. You should probably speak to a bankruptcy attorney.
Your home is probably safe from a deficiency judgment, but other things you own may not be, including wages. You should consult with a bankruptcy attorney soon, before the judgment creditor can do anything else.
You should use an attorney that speciallizes in franchise law, or if you cannot find one, at least corporate law. In general, before signing any type of contract, you should have an attorney review it who specializes in the area at issue. This includes real estate agreements, employment contracts, marital agreements, promissory notes, etc.
Most law firms in our area use a payment plan for Chapter 13, where a portion of the fee is paid before you file, and the rest is paid over the life of the Chapter 13 Plan. However, if you are looking for an attorney who will prepare your bankruptcy and file it for nothing up front, and the entire fee over the life of the Plan, I doubt that you will find that.
Your Plan payment is determined either by the amount of disposable income you have each month, or by the value of everything you are keeping. The court will take the highest number. There is no option for "keeping it low." Your attorney should always try to get your payment as low as possible, but the payment is determined by these formulae. I am surprised that your attorney did not explain this to you.