We are really close to the bike trail so our plan was to have a large indoor closet with mounts to store bikes as an example.  

I think the reason is these tech companies are realizing the efficiency of remote work, therefore allowing the San Francisco RE market to deflate some pressure and let people live an hour away. 

Hello @Mike MontanyeAs others have  stated, don't be pressured into making a hasty decision. 

But the gas cannot be turned on because it cannot hold the pressure.

I've been an environmental lawyer for over 35 years and have encountered only one home tank that exceeded $100K and that was an extraordinary situation where there was pressurized piping with a diesel tank and where the consultant committed fraud by over-excavating the site. most home heating oil tanks will range from $10K to $20K with costs approaching $50K-100K where groundwater is impacted and used for drinking purposes.   

@Rogers MarquessRTU drains should be trapped if they are negative pressure unitsIt may seem elementary to ask but is the unit pitched towards the drain?

It could also be a pressure problem due to higher elevation from the source. 

Being debt free takes off alot of the pressure I still drive my 2001 F250 with 225k miles.

(Few tree roots, all plasticO it’s out main water lines that are metal and under pressure, that fail most often. 

In addition to surface water, underground water that will exert pressure on the walls must be captured and discharges away from the structures in order to avoid major headaches.