pvt ltd company directors disappeared without closing company

There is no connection between leased property vacation and closing of the company. Both are different. there is no compulsion to close the company due to vacate the property

Why you are so concerned with the company be closed?

Mere vacation of premises is not a logical conclusion that the company was the wind off and temporarily they might have stopped.  If you have any specific grievance as lessor against the company, issue notice to the lessee Directors as per your local advocate's opinion, if your interests are affected.

In response to your query, 

I think just because the company has vacated your leased property doesn't mean that a company is wind up, I think you should be worried about the benefits for you as lessor only if they don't abide by the agreement. In that case you can contact the company directly and understand the situation an in case you feel there is anything suspicious you can always find an FIR to protect yourself from any kind of offense to which you can be a victim in future. 

Regards,

Aryan Raj 

The company / lessee may continue or close their business is none of the business of landlord.

As a landlord you are concerned with your rent and other terms of the lease and licence executed.