building_model.tex

\documentclass[tikz, border=7pt]{standalone}

\usepackage[T1]{fontenc}
\usepackage[english]{babel}

\usepackage{tikz}
\usepackage{fourier}

\usetikzlibrary{calc, 3d}

\begin{document}
	\tikzset{face/.style={fill=lightgray,draw=black,very thin,line join=round}}
    \begin{tikzpicture}[x  = {(-0.5cm,-0.5cm)},
                        y  = {(0.9659cm,-0.25882cm)},
                        z  = {(0cm,1cm)},
                        scale = 1,
                        color = {lightgray}]
        \begin{scope}[canvas is zy plane at x=0]
          	\path[face,shade] (0,0) -- (2,0) -- (2.5,1.75) -- (2,4) -- (0,4) -- cycle;
        \end{scope}
        \begin{scope}[canvas is zx plane at y=0]
  			\path[face,shade] (0,0) rectangle (2,3);
		\end{scope}
        \begin{scope}[canvas is zy plane at x=3]
            \path[face] (0,0) -- (2,0) -- (2.75,2.5) -- (2,4) -- (0,4) -- cycle;
		\end{scope}
        \begin{scope}[canvas is zx plane at y=4]
          	\path[face] (0,0) rectangle (2,3);
        \end{scope}
        \path[face] (0,0,2) -- (0,1.75,2.5) -- (3,0,2) -- cycle;
        \path[face] (3,0,2) -- (0,1.75,2.5) -- (3,2.5,2.75) -- cycle;
        \path[face] (0,4,2) -- (3,2.5,2.75) -- (0,1.75,2.5) -- cycle;
        \path[face] (0,4,2) -- (3,2.5,2.75) -- (3,4,2) -- cycle;
    \end{tikzpicture}
\end{document}