Question: What is the population of the city where The Château du Grand-Blottereau is located ?

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Lake Genval: Lake Genval (Dutch: "Meer van Genval" , French: "Lac de Genval" ) is a lake located in Belgium, southeast of Brussels near the Sonian Forest and the cities of Rixensart, Walloon Brabant and Overijse, Flemish Brabant.  A popular vacation and holiday destination, the lake is surrounded by turn-of-the-century homes built during the Belle Époque.  Situated on the lake's south is the Château du Lac, a five-star hotel, restaurant, and bar.

Nantes: Nantes (] ) (Gallo: "Naunnt" or "Nantt" (] or ] ); Breton: "Naoned" (] ) ) is a city in western France on the Loire River, 50 km from the Atlantic coast.  The city is the sixth-largest in France, with a population of nearly 300,000 in Nantes and an urban area of 600,000 inhabitants.  With Saint-Nazaire, a seaport on the Loire estuary, Nantes forms the main north-western French metropolis.

Clos Lucé: The Château du Clos Lucé (or simply Clos Lucé) is a large château in the city of Amboise, France.  The place is famous for being the official residence of Leonardo da Vinci between 1516 and 1519, when Leonardo died.

Château du Lude: The Château du Lude is one of the many great châteaux of the Loire Valley (Vallée de la Loire) in France.  The chateau is situated in the commune of Le Lude in the Sarthe department in the region of Pays-de-la-Loire and stands at the crossroads of Anjou, Maine and Touraine.  Le Lude is the most northerly chateau of the Loire Valley and one of the last important historical castles in France, still inhabited by the same family for the last 260 years.  The château is testimony of four centuries of French architecture.  A stronghold transformed into an elegant house during the Renaissance and the 18th century.  The monument is located in the valley of le Loir.  Its gardens have evolved throughout the centuries.  It is a harmonious combination of French design and an English style landscape, with a rose garden, topiaries, a labyrinth and a botanical walk.

Château du Champ de Bataille: The Château du Champ-de-Bataille, is a castle located in the Eure department of the French region of Upper Normandy.  A baroque castle, Château du Champ-de-Bataille lies between the communes of Neubourg and Sainte-Opportune-du-Bosc, and in the "Campagne du Neubourg", between the river Risle to the west and the river Iton to the east.  It was built in the 17th century for the Maréchal de Créqui.

Château du Stuyvenberg: Stuyvenberg Castle (French: "Château du Stuyvenberg" , Dutch: "Kasteel van Stuyvenberg" , German: "Schloss Stuyvenberg" ) is a residency of the Belgian Royal Family, located in Laeken, Brussels.  Château du Stuyvenberg is situated at an altitude of 56 meters.

Château du Grand-Blottereau: The Château du Grand-Blottereau is a historic pavilion in Nantes, Loire-Atlantique, Pays de la Loire, France.

Château de Ranrouët: The Château du Ranroët is a castle existing since the 12th century, located in Herbignac in the Loire-Atlantique department of France.

Château de Chareil-Cintrat: The Château de Chareil-Cintrat, also known as the Château du Bas-Chareil is a late medieval château in France.  It is located near Chareil-Cintrat, in the Allier department, Auvergne.

Château de Rueil: The Château de Rueil (formerly spelled Ruel, also referred to as the Château du Val de Ruel) was a 17th-century French château located in Rueil-Malmaison.  It was especially famous for its gardens, created before those of Vaux-le-Vicomte and Versailles, and was the preferred residence of Cardinal Richelieu from at least 1633 (when he purchased it) until his death in 1642.

Supporting paragraphs: Château du Grand-Blottereau Nantes
Answer: nearly 300,000