This book deals with deriving pricing rules for Real Options which are based on exponential mean-reverting asset. In particular, we are interested in modelling the possibility of selling a poorly performing asset for a predetermined price L. Firstly, the option is considered to be homogenous in time, i.e. its value is only a function of the asset price, then we comprise the time-dependency and finally, we extend it to the case of stochastic interest rate modeled again by the exponential mean-reverting process. The book assumes some basic knowledge of stochastic analysis, numerical methods and financial mathematics. This book was written as author's MSc thesis at FNSPE at CTU in Prague.