This is a tax question, not a real estate question. I would assume you will be hit with a tax bill but you should consult with an accountant.

Payment of per diem by way of diminution of real estate purchase price.

I agree, there are several questions you need to answer before an attorney could provide you with any answers.

Can I sue my landlor if i was assulted and almost got kill at the entrace of my building ?

Your case may have merit but the facts have to be flushed out in great detail to make a determination.

What is the benefit of recording deed in MERS?

You can not actually record your deed in MERS, that does not create any legal notice, for that purpose you must record your deed in the county...

Do i have to pay office rent for the time our building was flooded and unusable after hurricane sandy in nyc?

You need to have your lease reviewed. Unless you had negotiated this particular point in your lease in your favor, in all likelihood you have no...