Your numbers look favorable for this scenario. 

Im attempting to build my credit in both the US and HK but its slow as younger me didn't do current me any favors.

Just do yourself one big favor and "RATE SHOP" and make sure your being quoted a PAR rate and not paying a buy down for a lower rate. 

Do me a favor, next time you're talking to one of your underwriters ask if they would pay a claim for an unpaid, unrecorded water bill and let me know the answer. 

Since this is a relative doing you a favor.  

We removed some existing tenants, and secured a 10 year lease on favorable terms from one existing tenant to move into newly renovated space in the building.

Industries are already relocating to favorable markets and the pandemic has forced companies to consider the option of remote work and cutting the tie to their current office location.  

Now, based on the information from you and others, my options are not in my favor.

In NJ, your best bet is to make it as easy on them as possible since tenant's rights are way in favor of the tenant.

However, at the 20% mark, I could pull a HELOC on my primary of up to 90% rather than using the HELOC on my investment property which is cheaper and has less favorable 70% LTV limits.If I'm understanding what you're saying correctly, you would say this is a poor allocation of money?