Mālpils Manor is widely known as a place of public gatherings and a travellers’ stopover. It stands out among Latvia’s restored manor centres with skilfully improved surroundings and an ambitious building and park ensemble with a beautifully restored manor house. The article deals with a largely unexplored structure behind the main building’s south wing. This is the Mālpils Manor orangery, also called Garden House in literature and still waiting for restoration. The building is justifiably included in the list of state-protected architectural monuments as one of the manor complex’s most valuable components. It consists of two parts. The north stone part facing the manor house, garden and pond is the orangery while the south-facing glazed structure is a hothouse. Information on the Mālpils Manor’s origins dates back to the second half of the 14th century when the Livonian Order stone castle was built. The new economic centre emerged in the present site in the 18th century. The manor began to flourish after 1760. Noteworthy is a late 18th century drawing with the north view of Mālpils Manor buildings. The drawing shows an arcaded granary instead of the present Garden House. Its construction history is much more recent, starting in the mid-19th century. The map of the manor properties with a list of buildings was drawn in 1859. This plan is the oldest document depicting the Garden House in its present volume. Until no more precise sources have emerged, one can assume the Garden House was built between 1849 and 1859. In the early 20th century, two orchards were cultivated nearby – the lower garden and the upper garden with 215 fruit trees and a flower nursery, possibly arranged in the Garden House’s hothouse and on its terrace. Miķelis Valkīrs, the Mālpils Manor gardener from 1896, took part in various garden shows and received awards for his home-grown peaches and apricots. In the second half of the 19th and early 20th century, the history of Mālpils Manor buildings is associated with the well-known Cēsis-based master builder Jānis Meņģelis (1829–1903) and his family. A reconstruction drawing for the hothouse at Kārļi Manor owned by the Sievers family bears the stamp “J. K. Mengel. Wenden” dated to 1888. It is not known whether and to what extent Meņģelis adapted the period’s standard hothouse designs but this one is the closest analogy to the hothouse on the south side of Mālpils orangery. Alterations were likely carried out in the last decades of the 19th century and we can only speculate that in Mālpils, similarly to Kārļi Manor, Meņģelis himself took part in the restoration or rebuilding of the hothouse. When the large Mālpils manor house burned down in 1905, the orangery was not damaged. A list of manor buildings, indicating their function and condition, was drawn up in 1918 for a compensation claim. A document mentioned for the first time that the Garden House had living quarters (Gartenhaus – Wohnhaus) and a hothouse (Treibhaus). During the Agrarian Reform of 1924, the owner was allowed to keep two residencies – the former manager’s house and the Garden House (with two rooms for the gardener in the orangery’s northeast wing). The Technical School of Hydromelioration was opened in the former manor house in 1949 and operated there until 1965. The Garden House was rebuilt to arrange student dormitories there. The central hall was divided into two storeys with the façade’s main door openings being walled up and having four windows installed. In 1987, restoration works of the Garden House were launched to the design by architect Ilgonis Alfs Stukmanis. From the 1990s up to 2004, the building was abandoned and most of the over 150 years old roof constructions perished during this short period. Architecturally the building consists of two parts. An imposing façade and orangery premises, later used as living quarters, faced north. The glazed hothouses were the only south-facing edifices. The main façade is accentuated with a gently sloping pediment and a three-bay entrance portal. High, wide doors facilitated the moving of plants. The entrance portal’s tectonic scheme includes four pilasters and an entablature topped with a pronouncedly protruding cornice bearing four stone (possibly porphyry) vases. The pediment is even higher and has small attics above its slopes. Within Historicist stylistic trends, façade décor with classical vases is typical of the so-called Berlin School’s Late Classicist examples. The hothouse of Mālpils Manor orangery consists of three parts with the raised middle one reaching to the orangery roof. The hothouse is the oldest of this type of building in Latvia that still retains the white-plastered, reflective back walls with a curved transition to the ceiling. This construction, called “swan neck” in literature, is seen already in 18th century examples. The “swan neck” is meant to reflect sunlight and concentrate warm air masses over plants. The glazed walls were dismantled in the mid-20th century. The orangery’s ground-floor plan is symmetrical, functionally focusing on a large hall with smaller rooms on each side connected by a service corridor along the longitudinal back wall. The Mālpils building belongs to the type of orangery with clear representation functions so it is no accident that it was located in the decorative main hall. The Garden House of Mālpils Manor was built in the 1850s, possibly after the young Alexander von Grote began to manage the manor in 1856 and most probably was the initiator of this new building. The Garden House is a unique monument in Latvia’s cultural history, uniting functionally close but semantically different parts – the hothouse and the orangery. Direct analogies to the Mālpils Manor orangery have not yet been found. Motifs such as cornices, small pediments above windows, avant-corps with pilasters etc., are found in stylistically close mid-19th century buildings. The designer of the Mālpils orangery was clearly influenced in his façade solutions by the Berlin School’s Late Classicism that developed in Germany in the first half of the 19th century. It is typified by rather simple, geometrically clear volumes, merging forms of Neo-Renaissance with Late Classicism. Major representatives of this trend are German architects Karl Friedrich Schinkel (1781–1841) and Friedrich Ludwig Persius (1803–1845). The new orangery emerges as an example of stylistic avant-garde before the Riga New German Theatre (the present Opera house) was built in 1863. Regrettably, the designer of the then modern building remains unknown. Mālpils Garden House architecture has been undervalued so far, being known only to narrow specialist circles. It deserves a full-fledged return to Latvia’s cultural heritage as both a balanced addition to the Mālpils Manor building and garden ensemble and an architecturally unique structure in the context of other manor orangeries in Latvia and the Baltic region.