The secondary entrance gate, known as the White Gate, was built in the mid-19th century. After the manor was demolished in 1927, this gate became the main entrance. On the manor side, there is a granite plaque embedded in the rectangular niche of the southern pillar, inscribed with: "Dear guest, let it be known to you and your homeland: In 1882, the first telephone line in Lithuania, Rietavas–Palanga, was established. In 1892, the first power plant in Lithuania began operating in Rietavas. These are the works of the Oginski princes for Rietavas and the Fatherland. 1992." Above the inscription is a brass relief plaque, with the text arranged in a circle:
"Centenary of Lithuania's electrification 1892 Rietavas 1992." Above it is a separate brass plaque with a lion and a symbol (the lion from the Oginski family coat of arms). The top is adorned with two concrete lion sculptures painted in bronze. One of the original weathered lion sculptures is preserved in the Telšiai "Alka" Museum. On the eastern facade of the northern pillar, a granite plaque is embedded low with the inscription: "The restoration of the lion sculptures was supported by joint-stock companies: Lithuanian Power Plant, Lithuanian Energy, Mažeikiai Power Plant, Eastern Distribution Networks, Western Distribution Networks. April 17, 2002."