public static String extractFlatWidth(String sourceText) {
		String[] lines = sourceText.split("\n");
		String result = "";
		try { // if result is with a wrong format or null, then reset it to empty string
			for (int i = 0; i < lines.length; i++) {
				if (lines[i].contains("Frontage:")) {
					// Previous Price: Frontage: 50.00 ft
					result = lines[i].split(" ")[3];
					break;
				}
			}
			Double.parseDouble(result);
		} catch (Exception e) {
			result = "";
		}
		return result;
	}