(ii) That he or she began to correct the condition which constitutes the violation promptly upon discovering it but that full correction could not be completed expeditiously because of serious technical difficulties, inability to obtain necessary materials, funds or labor;
(iii) That he or she was unable to gain access to the dwelling unit wherein the violation exists, or such other portion of the building as might be necessary to make the repair, provided that a postponement was granted pursuant to this subdivision; or
(iv) That he or she was unable to obtain a permit or license necessary to correct the violation, provided that diligent and prompt application was made therefore; or
(v) That the violation giving rise to the action was caused by the act of negligence, neglect or abuse of another not in the employ or subject to the direction of the owner, except that the owner shall be precluded from showing in defense or mitigation of such owner's liability for civil penalties evidence of any acts occurring, undertaken, or performed by any predecessor in title prior to the owner taking control of the premises. Where the aforesaid allegations are made by way of mitigation of penalties, the owner shall show, by competent proof, pertinent financial data and efforts made to obtain necessary materials, funds or labor or to gain access, or to obtain a permit or license and such other evidence as the court may require. If the court finds that sufficient mitigating circumstances exist, it may remit all or part of any penalties arising from the violations, but may condition such remission upon a correction of the violation within a time period fixed by the court.