Parking space Nicaragua - Managua

Hello, he we are again (from Holland). We are still on our worldtrip with the Landcruiser. At the moment, our car is in Panama. In a vew days, we will pick up the car and travel further to Nicaragua.
So we need a parking area with security in Managua. The car stays there for a couple of months (till our next trip).
Is there anybody who knows the adress for a parking space (with security)? We like to hear it as soon as possible. We're leaving in 2 days...
Thanks in advance.