Financing Advice - Starting up

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I recently left my corporate job to start up a full time vacation rental property business. I created an LLC and have one property owned by the LLC and 3 others personally owned. I am looking for some advice on the best way to pay for portfolio expansion. All 4 properties have 100% equity. I am having difficulty getting a mortgage for my next property as the LLC is less than a year old. Any ideas on the best way to finance a rapid expansion?

Also, any advice on how to transfer the personally owned properties to the LLC at a low cost?

Thanks!