A 65-year-old male with a history of hypertension (HTN) for over 10 years and a past history of wheezing suddenly presented with unconsciousness and left-sided hemiplegia. BP was 200/120 mmHg, blood glucose 11.2 mmol/L, and blood cholesterol 7.8 mmol/L. To what level should the BP be reduced during antihypertensive treatment?