Income from leasing of building

Friends, tell me one thing... A company does the business of constructing, leasing& selling the buildings, apartments,.....etc....The MOA of the company states that the objective of the business is "To carry on the business of constructing, erecting, building, repairing, remodeling, selling, leasing out and maintaing buildings, houses, apartments".   Can't we consider income from leasing of buildings as income from PGBP?

Please clear my doubt and mention the relevant provision and csse law if any relating to my question.

Thanks in advance...