More important than asking the broker about rates and options is to know what you want.
If you may sell the asset 2-3 years from now a five year mortgage may not be the best solution due to high payout penalties. If you envision flipping it within a year then using a closed, as opposed to open mortgage, is also not a good idea. The biggest decision, assuming a 5+ year hold is fixed vs. variable and a broker can not really help with that decision. For example right now five year money is in the low 3's but variable is prime minus 0.4, at least 0.5% or 16% cheaper. Will prime go down within the next two years ? Possibly ! Will it be higher in five years ? Maybe.
So, ask away, know what you want, take an educated guess at interest rates 3-5 years from now, make an educated guess on asset disposition and then make the best decision with the information available.