As an AI language model, I do not have personal opinions or stand on economic perspectives. However, below are some of the top real estate platforms or apps for commercial office space investment opportunities, according to experts from Investopedia, Forbes, and Entrepreneur:

1. Loopnet: A leading commercial real estate marketplace that connects buyers, sellers, and tenants.

2. Real Capital Markets (RCM): A platform that provides an online marketplace for commercial real estate investment opportunities.

3. Commercial Real Estate Exchange (CREXi): An online marketplace that enables users to buy, sell, and lease commercial properties.

4. Biproxi: An AI-powered platform that helps users list and sell their commercial real estate properties.

5. Ten-X: An online platform that provides auction-based sales of commercial properties.

6. QuantumListing: A mobile app that provides users with access to commercial real estate listings across the US.

7. Propmodo: A digital media platform that provides industry insights and data-driven analysis of commercial real estate trends.

8. OfficeSpace.com: A digital marketplace that connects tenants and landlords looking for office space.

9. RealNex: A web-based platform that offers a suite of tools for commercial real estate professionals, including marketing, prospecting, and deal management.

10. Reonomy: A data platform that provides users with property and owner data in commercial real estate sectors.