It shall be unlawful to erect, construct, reconstruct, alter, repair, convert, or maintain any structure or sign, or use any property, structure, or sign in violation of any regulations or any provisions of this chapter or any amendment or supplement lawfully adopted by the Mayor and Council, or to fail to comply with any reasonable requirement or conditions imposed by the Board of Appeals. Any person, firm, corporation, or other legal entity violating any provision of this chapter, or any amendment thereto, shall be charged with a violation and upon conviction shall be fined not less than $100 nor more than $500 for each violation. Each and every day during which such violation occurs or continues may be deemed a separate offense.