The Richter Park Golf Course has gotten approval from the City of Danbury for help with its new driving range.  The City Council has approved a low-interest loan of up to $600,000, to be repaid in under 15 years.  The proposal could have two dozen bays for public use and another two to three bays for  teaching and professionals.  A 10th hole would need to be rebuilt.  Annual revenue estimates are between $ 125,000 to $228,000.  Expenses would be about $40,000, including loan repayment.  City Finance Director David St. Hilaire says his office would revise the terms of a 2015 loan to Richter Park, adding on the $600,000.  There is $ 1.3 million of the $1.5 million loan left to pay.