The heat exchanger removes the combustion products like CO2 and CO.

This is not: the great recession, depression or the dot-com bust, market crash of 1987, gas crisis of the 70s, the economic contagion in Asia.  

One other issue that Bill mentioned is lack of air intake for combustion.

@Brie SchmidtFirst violation is REMOVED THAT PORTION OF COMBUSTIBLE WOOD(more than 20% solid) WOODEN FENCE THAT EXCEEDS 4.5FT IN HEIGHT AND IS IN THE REQUIRED ZONING FRONT YARD SETBACK ZONING ORDINANCE SECTION NUMBER 17.17.0309, 170.2.035, 17.2.0305Second violation is more explanatory (obviously the contractor never pulled the permit for the fence) PERMIT FEE AND PENALTY TO BE ASSESSED FOR WORK COMPLETED WITHOUT A BUILDING PERMIT 13-12-080,  13-32-035

The Sanitary Inspector shall determine whetherthe said receptacles are badly broken or otherwise fail to meet therequirements of this section.C.Receptacles of refuse shall not be set out for collection, exceptduring hours of the day or days scheduled for collection of refuse, orthe evening before, and not before 8:00 p.m. of said evening.D.Receptacles shall be conveniently located on the premises for thestorage of refuse and maintained in such a manner as to prevent thecreation of a nuisance or a menace to public health.E.All refuse, garbage, combustible waste and noncombustible waste pickedup from any commercial enterprise by a private entity engaged in thebusiness of collecting and removing garbage from commercialenterprises shall be completed on the day scheduled for pickup betweenthe hours of 12:00 midnight to 7:00 a.m.

Those were the Dot Com bust on Wall Street, 9/11 and the Financial Crisis.I guess I'm used to it, but the Pandemic is just another Crisis to me in which I will be just fine! 

stock crash was a few years before I purchased our first RE, but I do not remember it resulting in a significant RE price decline but I was just graduating from college and could have simply been unaware.The Dot Com bust (circa 2000), in the local market, had RE prices rising. 

I got quotes of $35,000, $40,000 and $35000.Cut out and remove the existing cast iron hot water boiler, both hot water heaters.Cut out and remove the existing 11/2"-21/2" supply and return heating mains that run from the mechanical room (back of the house) to the meter room (front of the house).Install 2- 9 port manifold stations in the mechanical for supplying heat to the cast iron radiators.Plumb the supply and return (home runs) 1/2" pex tubing for the cast iron radiators from the manifolds to the existing branch of risers in the basement ceiling.Pressure test all piping.Pipe new 11/4"x 50' gas piping from the meter room to the mechanical room.Pressure test gas piping.Install a HTP UFT 140 high efficient modulating condensing hot water boiler and a Turbomax 45 Reverse Indirect Tank (Buffer tank and Potable hot water) with near boiler piping and controls containing:The supply and return header piping from the UFT 140 boiler to the Turbomax 45 will be piped in a 2 pipe buffer tank configuration.Isolation drain and purge valves.Air and dirt magnet separators.High efficient ECM circulating pumps with isolation pump flanges.Hydronic expansion tank with support bracket.Back flow preventer and auto filer combo unit.Inline sediment and De-minerlized filter.Controls & Wiring:Low Water Cut Off.18- Manifold Actuators.Zone Control Box's.3-Thermostats with wireless sensors.Outdoor Sensor.Cold and Hot water potable water side:Isolation valves.Thermostatic mixing valve.Thermal expansion tank with support bracketPipe 3" Polypropylene and PVC flue and air intake piping from the boiler to the outside along with a thin low profile termination kit.Install a Condensate neutralizer pump and plumb the discharge tubing from the pump to the indirect stand pipe in the mechanical room.Pressure test all piping.Install and wire in all controls in the mechanical room.Power flush the system and remove any debris that is in the radiators and piping.Drain the water out of the entire system.Re-fill the entire heating system with De-mineralized water and power purge all the air out of the entire system.Set and adjust the flow meters on the manifolds as per radiators btu's output.Perform a combustion analysis on the boiler and make any adjustments if needed.

Handicapped accessibility, exiting, fire protection (metal studs, other non-combustible materials) fire sprinklers, insulation, lighting, HVAC, all will be somewhat different for commercial spaces.

My primary goal is to move as far away from the combustion of fossil fuels as quickly and practically as possible.