Architectural lithograph plates in the French Art Nouveau style

This item consists of oversized illustrated plates from a collection of architectural monographs, appearing consistent with French publications from the late 19th or early 20th century. The visible pages feature detailed black-and-white lithographic or gravure illustrations of building facades, interior decorations, and fireplaces. Text on the pages includes 'MAISON BOULEVARD DE COURCELLES No. 29 A PARIS' and attributes the designs to 'ARCHITECTE M. X. SCHOELLKOPF' and 'SCULPTEUR M. M. ROUILLIÈRE.' The user identifies this as a set of 10 books titled 'Maison monographs' measuring 12x16 inches, though this claim remains unverified beyond the visual evidence. The illustrations showcase organic, flowing motifs and highly decorative stonework characteristic of the Art Nouveau movement. The paper appears aged with a warm yellow patina and shows some wear, including visible creasing at the top of the pages and minor foxing or discoloration consistent with antique books. The lack of a visible cover or title page prevents a definitive identification of the specific edition or total volume count, making the user-supplied details a hypothesis subject to in-person inspection.

Based on my examination of the provided images, this item appears to be a set of oversized architectural lithographic plates showcasing the work of architect Xavier Schoellkopf. The owner identifies this as a 10-volume set of 'Maison monographs' measuring 12x16 inches. Based on the visible text referencing 'MAISON BOULEVARD DE COURCELLES No. 29', the plates appear consistent with high-quality late 19th or early 20th-century French architectural publications. From what I can see, the plates exhibit the organic, fluid ornamentation of the Art Nouveau movement and bear markings consistent with the period and known designers of that era. I cannot verify the total volume count or the completeness of each book from the photos; a physical inspection would be required to confirm the integrity of the bindings and the presence of all plates. The value estimate of $1,000 to $2,500 assumes the user-supplied claim of 10 books is accurate and that the set is largely complete. In the current market, there is steady demand for Art Nouveau architectural studies among collectors and interior designers. However, condition is a major factor; while the visible foxing and creasing are typical for antique paper, it does impact the overall valuation. Authentication of the edition and publisher would be necessary to reach the high end of this range. If these are found to be modern reproductions or later reprints rather than the contemporary architectural plates suggested by the patina, the value would likely drop significantly to a decorative range of $100 to $300. To confirm the value, a specialist would need to verify the paper's watermark, the printing technique (heliogravure vs. offset), and provenance records.