Not sure exactly what you are asking...certainly if you can buy it rehab it and sell it for more than you spent, you can make money on it...though that's pretty obvious...
The question is whether that's really realistic...
Some things to consider:
Any property that is listed for $90K and needs $200K worth of work has to be in TERRIBLE condition. We're clearly not talking about a gut rehab on a low-end property (which wouldn't cost $200K) and we're also not talking about a cosmetic renovation on a high-end property (wouldn't be able to pick it up that cheaply), so what kind of property can you buy for $90K, put in $200K and still make a nice profit?!?!
All I can think of is a relatively high-end property (or high-end property) that has a lot of structural issues, mold or some combination of those. And if this is your first flip, you probably don't want to tackle those things.
If it's not one of those types of properties, I'd suggest verifying your numbers. What do you plan to do for $200K? What is the ARV of the property?
Also, consider that in many parts of the country, higher-end houses (in my area, that would be anything over $500K, but certainly varies area to area) can be VERY difficult to sell in this market.
Will this be considered a high-end house when you're done with it? If so, what makes you think you can sell it in this market?
What type of financing do you plan to get? You mentioned hard money. To borrow $200-300K in hard money, your monthly payments will likely be on the order of $3000-5000, and you'll probably have to come out of pocket at least $50-75K on the purchase side.
You also implied that you're considering holding it as a rental (you said, "Potential After-Renovation Annual Income: $100,000+"). Seems very unlikely that a property that you're all-in for under $300K will rent for more than $8000/month, but if so, that would be very lucrative -- ASSUMING you could get conventional financing.
There's no way you'll be able to get long-term hard-money, and even if you did, with debt service between $3000-5000/month, you might find yourself in a bad situation if you have a few months of vacancy.
Do you have comps on this property? An appraisal? Do you have bids from contractors? A $200K budget can easily overrun by $50K...are you prepared for that contingency?
Anyway, without a lot more information, it's difficult to give you concrete advice, but just based on my experience, the information you have provided leads me to believe this deal probably is a bit tougher than you're making it out to be...
Updated: 11:47AM, 03/03/2011
Whoops...as Bryan points out below, this is probably a commercial property, so my comments likely don't apply (didn't realize this was in the Commercial RE forum when I replied).