In this work, we investigate, theoretically and experimentally, the signal power distribution in the space domain. The investigation is based on the framework of the combined statistical modeling approach that was originally proposed for the outdoor urban environments. In the present work the proposed multi-parametric approach is adopted for modeling the indoor propagation conditions. This is achieved by combining guiding effects of radio propagation along the corridor in LOS conditions and multi-ray phenomena caused by the multiple scattering, reflection and diffraction by numerous obstructions surrounding both terminal antennas, the transmitter (Tx) and the receiver (Rx) inside rooms lining corridors. The path loss for mixed outdoor/indoor scenarios is derived using the modified and combined statistical multi-parametric and waveguide indoor/outdoor models. The accuracy of the proposed models is validated using measurements. The path loss spatial distribution along the radio paths between Tx and Rx antennas is measured by a special measurement method using highly directive adaptive antennas operating at frequency of about 2.5-2.8 GHz. A good agreement between theoretical prediction and results of measurements is obtained.