Berlin-based office property specialist Polis Immobilien on Friday announced significant sales and earnings growth in 2007. According to preliminary figures released by the company, rental income more than doubled in 2007, rising to around EUR 9.8 mln from EUR 4.3 mln in 2006. Income from current property management came in at about EUR 8.5 mln in 2007, also more than double the EUR 3.2 mln seen the year earlier.