That being said, if you look at the smaller cabins (900 to 1,200 sq ft), I think the numbers are still very strong. 

Is the 25% from LPs realistic based on today's market?

I'm going to reiterate what's already been mentioned above, but I'm going to actually give you examples of why it's relevant to you to find a U.S. tax professional.1 - You're going to need to file U.S. taxes once you have property down here, there's federal filings, state filings, and sometimes local filings too2 - Tons of tax treaties between the U.S. and Canada that are easy to miss and can cost you a lot of money (important one with rentals - effectively connected income - if the professional you talk to doesn't know what this is, run away)3 - The amount of days you spend in the U.S. needs to be tracked and if you go over a threshold, all of your worldwide income could be taxable by the U.S.4 - Selling real property means up to 15% of your sales proceeds might not be available to you for years (FIRPTA)5 - Lots of nuance at the state and local levels, which both want to take as much money from you as possibleMain takeaway here is that you should find a U.S. based tax person.

As a result the property, based on capitalization rates, can now be sold for $450,000.  

Highlighting the strong profit potential and taking measures to address any concerns about costs, scope, or holding risks will make this an even stronger pitch.

As for a corporate rental you can also see strong rental income with a little less risk since you would be renting to a corporation and they would be on the lease. 

Do you know who the top developers in your area are just based on new homes going up?

I've been allocating based on sf used all direct and indirect costs. 

DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.

Yes, there are times they do win and make money, but not on a frequent bases in my experience.