For an integer full column rank matrix $A$, we consider the lattice that consists of all integer combinations of columns of $A$. We prove that a shortest non-zero vector $Az$ has infinity norm equal to $1$ whenever the number of columns of $A$ is at least $Δ$, the largest absolute value of a full rank subdeterminant of $A$. This structural result allows us to design a fixed-parameter tractable algorithm in $Δ$ for computing a shortest lattice vector in the infinity norm. It also has several applications in integer optimization. In particular, for a polyhedron defined by $Ax\leq b$ with integer-valued $b$, an optimal integer solution lies on a face whose dimension is at most $Δ- 1$.

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