You need to think if your content is truly different from your existing site then you may want to create a subdomain.

VRG's Local SEO Podcast

Should you use a subdomain

Mike Goldstein from VRG Web Design and Digital Marketing Agency reveals all of his web design, local SEO and social Media marketing strategies and internet advertising tips and tricks so you can be ahead of the curve with your online promotions and search engine marketing to generate more interest in your business and things you can do yourself to increase your company's placement in search engine results pages.

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VRG's Local SEO Podcast