Question: The 1988 IAAF Grand Prix Final took place in a stadium that was originally built for what purpose?

Context paragraphs:
1999 IAAF Grand Prix Final: The 1999 IAAF Grand Prix Final was the fifteenth edition of the season-ending competition for the IAAF Grand Prix track and field circuit, organised by the International Association of Athletics Federations.  It was held on 11 September at the Olympic Stadium in Munich, Germany.

2001 IAAF Grand Prix Final: The 2001 IAAF Grand Prix Final was the seventeenth edition of the season-ending competition for the IAAF Grand Prix track and field circuit, organised by the International Association of Athletics Federations.  It was held on 9 September at the Olympic Park Stadium in Melbourne, Australia.  It was the first and only time that the event was held in the southern hemisphere (international track and field seasons typically revolve around a northern hemisphere schedule).

Olympiastadion (Berlin): Olympiastadion (] ) is a sports stadium in Berlin, Germany.  It was originally built for the 1936 Summer Olympics by Werner March.  During the Olympics, the record attendance was thought to be over 100,000.  Today the stadium is part of the Olympiapark Berlin.

1998 IAAF Grand Prix Final: The 1998 IAAF Grand Prix Final was the fourteenth edition of the season-ending competition for the IAAF Grand Prix track and field circuit, organised by the International Association of Athletics Federations.  It was held on 5 September at the Luzhniki Stadium in Moscow, Russia.

1996 IAAF Grand Prix Final: The 1996 IAAF Grand Prix Final was the twelfth edition of the season-ending competition for the IAAF Grand Prix track and field circuit, organised by the International Association of Athletics Federations.  It was held on 7 September at the Arena Civica in Milan, Italy.

1988 IAAF Grand Prix Final: The 1988 IAAF Grand Prix Final was the fourth edition of the season-ending competition for the IAAF Grand Prix track and field circuit, organised by the International Association of Athletics Federations.  It was held on 13 September at the Olympiastadion in West Berlin.  Saïd Aouita (5000 metres) and Paula Ivan (1500 metres) were the overall points winners of the tournament, with this being Aouita's second win at the completion following his 1986 victory.

1997 IAAF Grand Prix Final: The 1997 IAAF Grand Prix Final was the thirteenth edition of the season-ending competition for the IAAF Grand Prix track and field circuit, organised by the International Association of Athletics Federations.  It was held on 13 September at the Hakatanomori Athletic Stadium in Fukuoka City, Japan.

1990 IAAF Grand Prix Final: The 1990 IAAF Grand Prix Final was the sixth edition of the season-ending competition for the IAAF Grand Prix track and field circuit, organised by the International Association of Athletics Federations.  It was held on 7 September at the Olympic Stadium (Athens) in Athens, Greece.  Leroy Burrell (100 metres) and Merlene Ottey (200 metres) were the overall points winners of the tournament.  This was Ottey's second series win (having previously won in 1987) and made her the second woman to win the honour twice, after Paula Ivan.  The number of athletics events in the programme reached eighteen for the first time, with ten for men and eight for women.

2000 IAAF Grand Prix Final: The 2000 IAAF Grand Prix Final was the sixteenth edition of the season-ending competition for the IAAF Grand Prix track and field circuit, organised by the International Association of Athletics Federations.  It was held on 5 October at the Khalifa International Stadium in Doha, Qatar.  It was the first and only time that the event was held outside of September, due in part to Qatar's hot desert climate.

1987 IAAF Grand Prix Final: The 1987 IAAF Grand Prix Final was the third edition of the season-ending competition for the IAAF Grand Prix track and field circuit, organised by the International Association of Athletics Federations.  It was held on 11 September at the King Baudouin Stadium in Brussels, Belgium.  Tonie Campbell (110 metres hurdles) and Merlene Ottey (100 metres) were the overall points winners of the tournament.

Supporting paragraphs: 1988 IAAF Grand Prix Final Olympiastadion (Berlin)
Answer: 1936 Summer Olympics