\documentclass{standalone}
\renewcommand{\rmdefault}{phv} % Arial
\renewcommand{\sfdefault}{phv} % Arial
\usepackage[T1]{fontenc}
\usepackage{color}
\usepackage{colortbl}
\usepackage{graphicx}
\usepackage{tikz}
\usetikzlibrary{arrows,shapes,positioning,shadows,trees}
\begin{document}
\tikzset{
basic/.style = {draw, drop shadow, font=\sffamily\small,
rectangle,minimum width=4cm,minimum
height =5em, text width = 3.6cm, align = flush center}
, node distance = 2.4cm,
root/.style = {basic, thin, align=center},
%level 1/.style={basic}, edge from parent fork down, sibling distance = 4cm, level distance =4cm,edge from parent/.style={draw},
level 1/.style={basic}, edge from parent fork down,edge from parent/.style={draw},
}
\begin{tikzpicture}
\node [root,fill = blue!20] (OUT-001) {Project Office}
%KEYS for OUT-001 (1): STF-146
child {%Start STF-146
node [level 1, below of = OUT-001,fill = blue!40] (STF-146) {Project Director\\{\it STF-146}}
%KEYS for STF-146 (3): STF-149|STF-148|STF-101
child {%Start STF-148
node [level 1, below of = STF-146,fill = blue!60] (STF-148) {Development Manager\\{\it STF-148}}
}%Close STF-148
child {%Start STF-149
node [level 1, left of=STF-148,xshift =-2cm,fill = blue!60] (STF-149) {OnBoarding Manager\\{\it STF-149}}
}%Close STF-149
child {%Start STF-101
node [level 1, right of=STF-148,xshift =2cm,fill = blue!60] (STF-101) {Chief Architect\\{\it STF-101}\\(Benoît Schoeffler)}
}%Close STF-101
};%Close STF-146
\end{tikzpicture}
\end{document}