public MarketSign getMarketSign(Block block) {
		for (MarketSign sign : sellsigns) {
			if (sign.getBlock().equals(block)) {
				return sign;
			}
		}
		for (MarketSign sign : rentsigns) {
			if (sign.getBlock().equals(block)) {
				return sign;
			}
		}
		return null;
	}