As someone already experienced in photography you already know that one lens won't adequately cover the range of subjects you mentioned. For example, architectural photographers make good use of wide angle lenses, while portrait photographers often prefer a lens longer than "normal". Given that, if you want one lens you're going to have to work harder to make it cover all the variety of interests you have.
By using only one half of a Gauss type lens (like the Schneider Symmar) one gains a longer focal length.
With current models this is not advised by the manufacturer. Furthermore it is clumsy.