Great question! There are a few important questions I think need answering before you can make this decision in good conscience.
Is that profit of an estimated 45K enough for you to start flipping houses like you want or will you need more start up capital? From the sound of it with you saying you'll be going for a loan I'd guess not? In that case, if you're up to the task of landlording, I think holding onto the property and allow it to generate income for you is probably the better move at the moment.
That being said, you should be prepared for finding a tenant and maintaining that property unless you can afford to have a property manager handle the day to day while the condo passively generates you income.
If you aren't planning to hire a property manager I'd suggest you take the time to:
1. Familiarize yourself with your tenant's rights based on your state (Nolo.com has a great list to start with: http://www.nolo.com/legal-encyclopedia/state-landlord-tenant-laws)
2. Develop a strong screening process to avoid nightmare tenants (I can go more into this if you'd like, but the big 3 for me are: meet them in person, get 2 references from previous employers/landlords, and run a full credit and background check on http://www.myrental.com/).
3. Have a trustworthy handyman (assuming you don't have the time or skills needed to maintain EVERY aspect of the home you're legally required to) and lawyer on speed dial in the event something goes wrong.