If you are under 3 years I would expect that renting would be more profitable than buying would be when all costs are considered. Do your calculations and see for yourself.
It some cases it may not be good idea to rent to own. You do not know what the market will be in the future and it is very difficult to agree on a set price now in such a voltile market. Also, in your current situation, if you were really looking at owning your home, wait until your temp becomes a permanent job. You might be able to qualify to purchase a home.
For now it would be better for you to rent than own. I wouldn't tell you to sign a lease to own contract, however if you find a house or condo you like that has been on the market for quite some time you might direct your agent to approach the seller with the "rent to own" scenario. There are a couple of different ways to go about this. 1. lease with the option to buy. 2. Lease purchase. and 3. Contract Sale. All 3 of these "rent to own" scenarios need to be written up by a real estate attorney. If you have any further questions feel free to ask.
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