Question: The place where Flores Athletic Club was an Argentine sports club from was considered a rural area of the Province of Buenos Aires until what year?

Context paragraphs:
Flores Old Ground: The Flores Old Ground (also known as "Old Polo Ground" or "Old Polo Field" or "Flores Polo Ground") was the stadium of defunct Flores Athletic Club.  Located in the barrio of Caballito, Buenos Aires, just behind the Buenos Aires Western Railway freight sheds, it hosted several polo, rugby union, association football and cricket matches during the period Flores A.C. was active.

Racing de Olavarría: Racing Athletic Club is an Argentine sports club located in Olavarría, Buenos Aires Province.  The club is mostly known for its football team, which currently plays in Torneo Argentino A, the regionalised third division of Argentine football league system.

Flores, Buenos Aires: Flores is a middle class "barrio" or district in the centre part of Buenos Aires city, Argentina.  Flores was considered a rural area of the Province of Buenos Aires until 1888 when it was integrated into the City.

Flores Athletic Club: Flores Athletic Club was an Argentine sports club from Flores, Buenos Aires.  The club was pioneer in the practise of some sports that would become popular in Argentina, such as football (competing in some of the first official championships held), rugby union and polo.

Lomas Athletic Club: Lomas Athletic Club is an Argentine sports club from the Lomas de Zamora district of Greater Buenos Aires.  One of Argentina's oldest clubs still in existence, Lomas is one of the four institutions that founded the "River Plate Rugby Championship" (current Unión Argentina de Rugby) in 1899, The rugby union team plays at Torneo de la URBA, the top division of Argentine rugby.

Club Atlético Ferrocarril General San Martín: Club San Martín (formerly Pacific Rugby Athletic Club) is an Argentine sports club based in the Sáenz Peña neighborhood of Greater Buenos Aires.  San Martín is mostly known for its rugby union team, which currently plays in Torneo de la URBA Grupo I, the first division of the Unión de Rugby de Buenos Aires.  The club also a field hockey squad which participates at tournaments organised by the Buenos Aires Hockey Association.

Lobos Athletic Club: Lobos Athletic Club is an Argentine sports club based in the city of Lobos, Buenos Aires.  Although other sports were practised at the club, Lobos Athletic is mostly known for its football team, who took part in the Primera División championships until its disaffection, being runner-up in 1898 and 1899.  Nowadays Lobos AC plays in Lobos Football League, a regional football tournament in Buenos Aires.

Buenos Aires Rowing Club: Buenos Aires Rowing Club is an Argentine sports club sited in Tigre, Buenos Aires, 30-km distance from the Buenos Aires autonomous city.  Founded in 1873 and originally headquartered in the capital city, BARC is the oldest rowing club of Argentina.

Club San Albano: Club San Albano is an Argentine sports club from the Burzaco district of Greater Buenos Aires.  San Albano is mostly known for its rugby union team, which currently plays at Torneo de la URBA Grupo I, the first division of the Unión de Rugby de Buenos Aires league system.  The field hockey team competes at tournaments organized by the Buenos Aires Hockey Association.

Buenos Aires Cricket &amp; Rugby Club: Buenos Aires Cricket & Rugby Club, sometimes known simply as Buenos Aires, is an Argentine sports club based in San Fernando, Buenos Aires.  The club claims to be the oldest club still in existence in Argentina, according to reports of a cricket match played by the club in Recoleta, Buenos Aires, in 1831.

Supporting paragraphs: Flores Athletic Club Flores, Buenos Aires
Answer: 1888