If you are using biblatex-ext's drop-in replacement for verbose (ext-verbose), you can just redefine the macro \locdatedelim.
\RequirePackage{filecontents}
\begin{filecontents*}{\jobname.bib}
@book{darwin,
author = {Charles Darwin},
address = {Cambridge},
title = {The Correspondence of {Charles} {Darwin}, 1821--1836},
year = {1985},
}
\end{filecontents*}
\documentclass{article}
\usepackage[style=ext-verbose]{biblatex}
\addbibresource{\jobname.bib}
\renewcommand*{\locdatedelim}{\addspace}
\begin{document}
Lorem \autocite{darwin}
\printbibliography
\end{document}

If you can't or don't want to use biblatex-ext, you can redefine the macros directly. Either
\newcommand*{\locdatedelim}{\addspace}
\newcommand*{\locpubdelim}{\addcolon\space}
\newcommand*{\publocdelim}{\addcomma\space}
\newcommand*{\pubdatedelim}{\addcomma\space}
\newbibmacro*{pubinstorg+location+date}[1]{%
\printlist{location}%
\iflistundef{#1}
{\setunit*{\locdatedelim}}
{\setunit*{\locpubdelim}}%
\printlist{#1}%
\setunit*{\pubdatedelim}%
\usebibmacro{date}%
\newunit}
\renewbibmacro*{publisher+location+date}{%
\usebibmacro{pubinstorg+location+date}{publisher}}
\renewbibmacro*{institution+location+date}{%
\usebibmacro{pubinstorg+location+date}{institution}}
\renewbibmacro*{organization+location+date}{%
\usebibmacro{pubinstorg+location+date}{organization}}
\renewbibmacro*{location+date}{%
\printlist{location}%
\setunit*{\locdatedelim}%
\usebibmacro{date}%
\newunit}
to get the same functionality as biblatex-ext, or something more specific like
\newbibmacro*{pubinstorg+location+date}[1]{%
\printlist{location}%
\setunit*{\addspace}%
\usebibmacro{date}%
\newunit}
\renewbibmacro*{publisher+location+date}{%
\usebibmacro{pubinstorg+location+date}{publisher}}
\renewbibmacro*{institution+location+date}{%
\usebibmacro{pubinstorg+location+date}{institution}}
\renewbibmacro*{organization+location+date}{%
\usebibmacro{pubinstorg+location+date}{organization}}
which would suppress the publisher if given.