I suggest you file an RTI regarding the status of the case and as to why the thing is taking so long. Moreover, move an application before the court citing the urgency of the matter to respectfully regulate the case on a prioritized basis or the scope of justice might remain inherently limited.
S. 133, CrPC definitely empowers a Magistrate to grant a conditional order for removal of nuisance.
S. 268 of IPC also makes Public nuisance an offense and it can definitely constitute Public Nuisance.
Move an application for urgent relief as the process must be causing you severe damage and it is prima facie illegal. Therefore, move an application before the Court to order the destruction of the constructions which are posing a great deal of hardship to you.
Also, the people in the appartment building collectively have a right over the common passage. Such construction can even fall under Criminal Trespass u/s 441, IPC. There are also ingredients of an offence u/s 339, IPC, called Wrongful Restraint.
As a last resort, keeping all such RTI applications' copies etc and responses from the Court, if nothing works, file a writ petition of Certiorari, in the High Court, laying down as to how the grave miscarriage of justice has been carried out by not providing a speedy disposal to the matter.
I would reccomend you to discuss the case with a local capable counsel if you wish to get some help about the entire procedure.