In all cases where the proposed improvement is the opening, widening, establishing, or extension of a public alley, the cost thereof shall be assessed against the property in the particular block in which said alley is situated, according to the benefits to be received therefrom, and against none other.
Source: L. 11: p. 376, § 9. C.L. § 9084. CSA: C. 163, § 127. CRS 53: § 50-6-9. C.R.S. 1963: § 50-6-9.