Why does the building across the road have more signs than me? Why is my neighbor’s building on the property line but mine can’t be?

Why is my neighbor’s building on the property line but mine can’t be? As with any law in government the laws/ordinances are changed from time to time. Council is enforcing the present laws/ordinances. Other properties are grandfathered under previous versions of ordinances and may not be required to comply with current ordinances unless renovations are done which exceed 50% of the total value of the property.