Question: Can a land lord lease a commercial property to person who clearly indicates that he will sell liquor or pork on the premises?

Answer: It is not permissible for a Muslim to let out his/her property to someone who will conduct Haraam business.  Selling liquor or pork are both Haraam. Hence, it will not be permissible to hire out a property to someone who intends to sell liquor or pork.

In the Noble Quraan, Allah Ta'ala says:

{وَتَعَاوَنُواْ عَلَى الْبرِّ وَالتَّقْوَى وَلاَ تَعَاوَنُواْ عَلَى الإِثْمِ وَالْعُدْوَانِ}

 "Assist one another in matters of righteousness and piety and do not assist each in sin and transgression."

 AND ALLAH KNOWS BEST