For a start, who is this other company and what is your relationship going to be with them?
I'm sure you're aware that you can work for only one brokerage company and, to some extent at least, aren't supposed to be working at any other job or, if you are doing so, need to disclose this fact on any licence application or renewal.
But if it's simply an investment you've been invited to make, the decision is yours, although you owe it to yourself to run things through a sufficiently good due diloigence exercise.
Duncan
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Acts as an Exclusive Buyer Broker for residential and non-residential properties in Canada's Niagara Peninsula.