My Options After Foreclosing On TLC

Hi All, I am a newbie to tax lien certificate investing, and, to get my feet wet, I bid on a 1.15 million dollar apartment building in Baltimore city last May (my bid is $600K). I am going to start foreclosing in a couple of months. I have several questions for the gurus in the forum: 1 - In case nobody redeems the property, at what time do I have to come up with $600K ? 2 - What are my options during/after foreclosures ? 3 - Any ideas on how I can get a $600K mortgage without access to the books ? 4 - Do you think I just screwed up big ways in my first deal ? The apartment building is occupied. Not one of those vacant buildings (Moskovitz taught me to stay away from those). Any ideas or comments are appreciated. :-S [addsig]